This achievement is for completing the synthesis section of the gummi phone. Now, don't get confused with the collection! Yes, you do need to do a lot of the collection, but not all of it. Though, it is helpful cause you can buy the materials (except crystals) which will require collecting 30 of each shard, 25 of each stone and 20 of each gem. Don't worry, I'll list locations for those later.
Now then, bare with me, I don't do video guides so this will be a very, VERY long guide, but you can skim through for what you're looking for if you like.
This achievement requires you to synthesize/create all 88 items, which will require various tasks (like moogle photos and some collections) to unlock these items to be available to create.
I will put a list of these items, how to unlock them and the materials required to create them:
ITEMS -
• Mega-Potion – Obtain 12 different synthesis materials
3 x Lucid Shard 3x Soothing Shard 3x Pulsing Shard 1x Hungry Stone
• Ether – Obtain 1 synthesis material
2x Wellspring Shard, 2x Lightning Shard, 2x Writhing Shard
• Hi-Ether – Obtain 12 different synthesis materials
3x Wellspring Stone, 3x Lightning Stone, 3x Writhing Stone, 1x Hungry Shard
• Mega-Ether – Obtain 20 different synthesis materials
3x Wellspring Stone, 3x Lightning Stone, 3x Writhing Stone, 1x Hungry Gem
• Refocuser – Obtain 20 different synthesis materials
3x Blazing Shard, 3x Lightning Shard, 3x Lucid Shard, 1x Hungry Shard
• Hi-Refocuser – Obtain 32 different synthesis materials
3x Blazing Stone, 3x Lightning Stone, 3x Lucid Stone, 1x Hungry Stone
• Elixir – Obtain 42 different synthesis materials
3x Wellspring Crystal, 2x Frost Gem, 2x Sinister Stone, 2x Sinister Shard, 2x Hungry Gem
• Megalixir – Obtain 50 different synthesis materials
3x Wellspring Crystal, 2x Frost Crystal, 2x Sinister Crystal, 2x Sinister Gem, 2x Hungry Crystal
• Strength Boost – Obtain 22 different synthesis materials
5x Wellspring Gem, 2x Soothing Crystal, 2x Pulsing Crystal, 2x Writhing Crystal, 1x Hungry Crystal
• Magic Boost – Obtain 22 different synthesis materials
5x Wellspring Gem, 2x Blazing Crystal, 2x Frost Crystal, 2x Lightning Crystal, 1x Hungry Crystal
• Defense Boost – Obtain 22 different synthesis materials
5x Wellspring Gem, 2x Lucid Crystal, 2x Twilight Crystal, 2x Sinister Gem, 1x Hungry Crystal
• AP Boost – Obtain 8 different synthesis materials
3x Wellspring Stone, 3x Betwixt Shard, 3x Twilight Shard, 1x Hungry Stone, 2x Hungry Shard
WEAPONS -
• Ultima Weapon – Obtain 58 different synthesis materials
7x Orichalcum+, 2x Wellspring Crystal, 2x Lucid Crystal, 2x Pulsing Crystal
• Warhammer+ – Obtain 18 different synthesis materials
2x Mythril Stone, 1x Fluorite, 1x Pulsing Gem, 1x Hungry Shard
• Astrolabe+ – Obtain 42 different synthesis materials
2x Mythril Crystal, 1x Electrum, 2x Lightning Gem, 2x Pulsing Gem, 1x Hungry Stone
• Heartless Maul – Obtain 48 different synthesis materials
1x Illusory Crystal, 2x Damascus, 1x Writhing Crystal, 2x Writhing Gem
• Heartless Maul+ – Obtain 52 different synthesis materials
1x Illusory Crystal, 2x Damascus, 1x Writhing Crystal, 2x Writhing Gem, 2x Hungry Gem
• Save the Queen – Obtain 55 different synthesis materials
1x Orichalcum, 1x Frost Crystal, 1x Lucid Crystal, 1x Soothing Crystal
• Save the Queen+ – Obtain 58 different synthesis materials
1x Orichalcum, 1x Frost Crystal, 1x Lucid Crystal, 1x Soothing Crystal, 1x Hungry Crystal
• Clockwork Shield+ – Obtain 18 different synthesis materials
2x Mythril Stone, 1x Fluorite, 1x Lucid Gem, 1x Hungry Shield
• Aegis Shield+ – Obtain 42 different synthesis materials
2x Mythril Gem, 1x Adamantite, 2x Frost Gem, 2x Pulsing Gem, 1x Hungry Stone
• Nobody Guard – Obtain 48 different synthesis materials
1x Evanescent Crystal, 2x Damascus, 2x Betwixt Gem, 2x Twilight Gem
• Nobody Guard+ – Obtain 52 different synthesis materials
1x Evanescent Crystal, 2x Damascus, 2x Betwixt Gem, 2x Twilight Gem, 2x Hungry Gem
•Save the King – Obtain 55 different synthesis materials
1x Orichalcum, 1x Blazing Crystal, 1x Lighting Crystal, 1x Pulsing Crystal
•Save the King+ – Obtain 58 different synthesis materials
1x Orichalcum, 1x Blazing Crystal, 1x Lightning Crystal, 1x Pulsing Crystal, 1x Hungry Crystal
ARMOR -
• Buster Band – Obtain 45 different synthesis materials
2x Mythril Crystal, 1x Wellspring Crystal, 2x Wellspring Gem, 2x Twilight Gem
• Buster Band+ – Obtain 50 different synthesis materials
2x Mythril Crystal, 1x Wellspring Crystal, 2x Wellspring Gem, 2x Twilight Gem, 1x Hungry Gem
• Fire Bangle – Obtain 2 different synthesis materials
3x Mythril Shard, 2x Blazing Stone, 5x Blazing Shard
• Fira Bangle – Obtain 10 different synthesis materials
3x Mythril Stone, 2x Blazing Stone, 5x Blazing Shard, 1x Hungry Shard
• Firaga Bangle – Obtain 25 different synthesis materials
3x Mythril Gem, 3x Blazing Gem, 5x Blazing Stone
• Firaza Bangle – Obtain 38 different synthesis materials
3x Mythril Crystal, 2x Blazing Gem, 5x Blazing Stone, 1x Hungry Stone
• Fire Chain – Moogle Photo Mission #8
1x Orichalcum, 3x Blazing Stone, 1x Sinister Stone, 2x Sinister Shard
• Blizzard Choker – Obtain 4 different synthesis materials
3x Mythril Shard, 2x Frost Stone, 5x Frost Shard
• Blizzara Choker – Obtain 10 different synthesis materials
3x Mythril Stone, 2x Frost Stone, 5x Frost Shard, 1x Hungry Shard
• Blizzaga Choker – Obtain 25 different synthesis materials
3x Mythril Gem, 2x Frost Gem, 5x Frost Stone
• Blizzaza Choker – Obtain 38 different synthesis materials
3x Mythril Crystal, 2x Frost Gem, 5x Frost Stone, 1x Hungry Stone
• Blizzard Chain – Moogle Photo Mission #12
1x Orichalcum, 3x Frost Stone, 1x Sinister Stone, 2x Sinister Shard
• Thunder Trinket – Obtain 4 different synthesis materials
3x Mythril Shard, 2x Lightning Stone, 5x Lightning Shard
• Thundara Trinket – Obtain 10 different synthesis materials
3x Mythril Stone, 2x Lightning Stone, 5x Lightning Shard, 1x Hungry Shard
• Thundaga Trinket – Obtain 25 different synthesis materials
3x Mythril Gem, 2x Lightning Gem, 5x Lightning Stone
• Thundaza Trinket – Obtain 38 different synthesis materials
3x Mythril Crystal, 2x Lightning Gem, 5x Lightning Stone, 1x Hungry Stone
• Thunder Chain – Moogle Photo Mission #9
1x Orichalcum, 3x Lightning Stone, 1x Sinister Stone, 2x Sinister Shard
• Shadow Anklet – Obtain 2 different synthesis materials
3x Mythril Shard, 2x Writhing Stone, 5x Writhing Shard
• Dark Anklet – Obtain 15 different synthesis materials
3x Mythril Stone, 2x Writhing Stone, 5x Writhing Shard, 1x Hungry Shard
• Midnight Anklet – Obtain 28 different synthesis materials
3x Mythril Gem, 2x Writhing Gem, 5x Writhing Stone
• Chaos Anklet – Obtain 40 different synthesis materials
3x Mythril Crystal, 2x Writhing Gem, 5x Writhing Stone, 1x Hungry Stone
• Dark Chain – Moogle Photo Mission #19
1x Orichalcum, 3x Writhing Stone, 1x Sinister Stone, 2x Sinister Shard
• Elven Bandanna – Obtain 4 different synthesis materials
3x Mythril Shard, 2x Soothing Stone, 5x Soothing Shard
• Divine Bandanna – Obtain 28 different synthesis materials
3x Mythril Gem, 2x Soothing Gem, 5x Soothing Stone
• Aqua Chaplet – Moogle Photo Mission #18
1x Orichalcum, 3x Soothing Stone, 1x Sinister Stone, 2x Sinister Shard
• Wind Fan – Obtain 8 different synthesis materials
3x Mythril Shard, 2x Lucid Stone, 5x Lucid Shard
• Storm Fan – Obtain 28 different synthesis materials
3x Mythril Gem, 2x Lucid Gem, 5x Lucid Stone
• Aero Armlet – Moogle Photo Mission #17
1x Orichalcum, 3x Lucid Stone, 1x Sinister Stone, 2x Sinister Shard
• Acrisius – Obtain 40 different synthesis materials
3x Mythril Crystal, 1x Blazing Crystal, 1x Frost Crystal, 1x Lightning Crystal
• Acrisis+ – Obtain 50 different synthesis materials
3 x Mythril Crystal1 x Blazing Crystal1 x Frost Crystal1 x Lightning Crystal1 x Hungry Gem
• Cosmic Chain – Obtain 55 different synthesis materials
1x Orichalcum, 1x Lucid Crystal, 1x Soothing Crystal, 1x Writhing Crystal, 1x Hungry Crystal
• Petite Ribbon – Moogle Photo Mission #20
2x Orichalcum, 1x Sinister Crystal, 1x Betwixt Crystal, 1x Hungry Crystal, 3x Hungry Shard
• Firefighter Rosette – Moogle Photo Mission #1
2x Mythril Stone, 2x Wellspring Shard, 6x Blazing Shard
• Umbrella Rosette – Moogle Photo Mission #2
2x Mythril Stone, 2x Wellspring Shard, 6x Soothing Shard
•Mask Rosette – Moogle Photo Mission #3
2x Mythril Stone, 2x Wellspring Shard, 6x Lucid Shard
• Snowman Rosette – Moogle Photo Mission #13
2x Mythril Stone, 2x Wellspring Shard, 6x Frost Shard
• Insulator Rosette – Moogle Photo Mission #11
2x Mythril Stone, 2x Wellspring Shard, 6x Lightning Shard
ACCESSORIES -
• Ability Ring+ – Obtain 2 different synthesis materials
2x Mythril Shard, 6x Lucid Shard
• Technician’s Ring+ – Obtain 12 different synthesis materials
2x Mythril Stone, 6x Lucid Stone
• Skill Ring+ – Obtain 18 different synthesis materials
2x Mythril Gem, 6x Lucid Gem
• Cosmic Ring – Moogle Photo Mission #4
2x Mythril Crystal, 3x Lucid Gem, 3x Pulsing Gem, 2x Hungry Gem
• Phantom Ring – Obtain 35 different synthesis materials
2x Mythril Crystal, 1x Pulsing Gem, 3x Pulsing Stone
• Orichalcum Ring – Obtain 45 different synthesis materials
1x Orichalcum, 1x Pulsing Crystal, 3x Pulsing Gem
• Sorcerer’s Ring – Obtain 35 different synthesis materials
2x Mythril Crystal, 1x Sinister Gem, 3x Sinister Stone
• Wisdom Ring – Obtain 45 different synthesis materials
1x Orichalcum, 1x Sinister Crystal, 3x Sinister Gem
• Soldier’s Earring – Moogle Photo Mission #5
2x Mythril Stone, 3x Pulsing Stone, 6x Pulsing Shard
• Fencer’s Earring – Moogle Photo Mission #14
3x Mythril Gem, 3x Pulsing Gem, 6x Pulsing Stone
• Mage’s Earring – Moogle Photo Mission #6
2x Mythril Stone, 3x Blazing Stone, 3x Lightning Stone, 3x Soothing Stone
• Slayer’s Earring – Moogle Photo Mission #15
3x Mythril Gem, 3x Blazing Gem, 3x Lightning Gem, 3x Soothing Gem
• Moon Amulet – Moogle Photo Mission #7
2x Mythril Stone, 3x Pulsing Stone, 3x Writhing Stone
• Star Charm – Moogle Photo Mission #16
3x Mythril Gem, 3x Pulsing Gem, 3x Writhing Gem
• Draw Ring – Moogle Photo Mission #10
3x Mythril Shard, 5x Pulsing Shard, 1x Betwixt Stone, 1x Twilight Stone
MATERIALS -
• Blazing Crystal – Obtain 30 different synthesis materials
1x Wellspring Crystal, 2x Blazing Gem, 3x Blazing Stone, 5x Blazing Shard
• Frost Crystal – Obtain 30 different synthesis materials
1x Wellspring Crystal, 2x Frost Gem 3x Frost Stone, 5x Frost Shard
• Lightning Crystal – Obtain 30 different synthesis materials
1x Wellspring Crystal, 2x Lightning Gem, 3x Lightning Stone, 5x Lightning Shard
• Lucid Crystal – Obtain 32 different synthesis materials
1x Wellspring Crystal, 2x Lucid Gem, 3x Lucid Stone, 5x Lucid Shard
• Pulsing Crystal – Obtain 30 different synthesis materials
1x Wellspring Crystal, 2x Pulsing Gem, 3x Pulsing Stone, 5x Pulsing Shard
• Writhing Crystal – Obtain 35 different synthesis materials
1x Wellspring Crystal, 2x Writhing Gem, 3x Writhing Stone, 5x Writhing Shard
• Mythril Shard – Obtain 6 different synthesis materials
1x Betwixt Shard, 1x Twilight Shard
• Mythril Stone – Obtain 15 different synthesis materials
1x Betwixt Stone, 1x Twilight Stone
• Mythril Gem – Obtain 32 different synthesis materials
1x Betwixt Gem, 1x Twilight Gem
• Mythril Crystal – Obtain 42 different synthesis materials
1x Betwixt Crystal, 1x Twilight Crystal
•Soothing Crystal – Obtain 32 different synthesis materials
1x Wellspring Crystal, 2x Soothing Gem, 3x Soothing Stone, 5x Soothing Shard.
That is all 88 items you need to create! Sorry this is so long, but this is a grind achievement lol.
Now, if you want the list on to where the best places to get these items, I'll list them here, but before that, a helpful recommendation: use the save/reload function with moogle post cards to get some Lucky Rings (which you'll have to do to get an Oricalcum+ that you will need anyways) and also to equip the Favorite Deputy keyblade for lucky strike. This will be a huge help when farming materials. You don't need to use it as your main, you can use ultima and still get the effects from the other two keyblades equipped.
• Blazing Shard - Battlegate 1
• Blazing Stone - Battlegate 1
• Blazing Gem - Monstropolis Rail Grind
• Blazing Crystal - Battlegate 12
• Frost Shard - Frost Serpent, Frozen Wall area in Arendelle
• Frost Stone - Frost Serpent, Frozen Wall area in Arendelle
• Frost Gem - Frost Serpent, Frozen Wall area in Arendelle
• Frost Crystal - Frost Serpent, Frozen Wall area in Arendelle (hit their wings)
• Lighting Shard - Battlegate 1
• Lightning Stone - Battlegate 4
• Lightning Gem - Battlegate 4
• Lightning Crystal - Battlegate 4
• Lucid Shard - Battlegate 7
• Lucid Stone - Battlegate 7
• Lucid Gem - Battlegate 10
• Lucid Crystal - Battlegate 10
• Pulsing Shard - Battlegate 6
• Pulsing Stone - Battlegate 6
• Pulsing Gem - Battlegate 1
• Pulsing crystal - Battlegate 11
• Writhing Shard - Battlegate 0
• Writhing Stone - Battlegate 0
• Writhing Gem - Battlegate 0
• Writhing Crystal - Battlegate 12
• Betwixt Shard - Battlegate 9
• Betwixt Stone - Battlegate 9
• Betwixt Gem - Battlegate 9
• Betwixt Crystal - Battlegate 9
• Twilight Shard - Battlegate 9
• Twilight Stone - Battlegate 9
• Twilight Gem - Battlegate 9
• Twilight Crystal - Battlegate 3
• Mythril Shard - Starlight Way Asteroids/blue crystals
• Mythril Stone - Starlight Way/Misty Stream Asteroids/blue crystals
• Mythril Gem - Misty Stream/The Eclipes Asteroids/blue crystals
• Mythril Crystal - The Eclipse Asteroids/blue crystals
• Sinister Shard - Monstropolis Factory Basement to Door Vault Service Area
• Sinister Stone - Monstropolis Factory Basement to Door Vault Service Area
• Sinister Gem - Monstropolis Factory Basement to Door Vault Service Area
• Sinister Crystal - Monstropolis Factory Basement to Door Vault Service Area
• Soothing Shard - Battlegate 10
• Soothing Stone - Battlegate 10
• Soothing Gem - Battlegate 10
• Soothing Crystal - Battlegate 10
• Wellspring Shard - Battlegate 10
• Wellspring Stone - Battlegate 10
• Wellspring Gem - Battlegate 10
• Wellspring Crystal - Battlegate 12
• Hungry Shard - Battlegate 3
• Hungry Stone - Battlegate 6
• Hungry Gem - various 8 from workshop collector goals/Frost Serpent in Frozen Wall area of Arendelle (hit their tails)
• Hungry Crystal - battlegate 12
• Fluorite - Starlight Way Asteroids/blue crystals
• Damascus - Starlight Way/Misty Stream Asteroids/blue crystals
• Adamantite - Misty Stream/The Eclipes Asteroids/blue crystals
• Orichalcum The Eclipse Asteroids/blue crystals
• Electrum The Eclipse Asteroids/blue crystals
• Evanescent Crystal - Battlegate 1 time reward from battlegate/battlegate 9.
• Illusory Crystal - Battlegate 2 time reward from battlegates/ battlegate 8
I HOPE THIS GUIDE HELPS!