The walkthrough made by Johnny Sinister will guide you to each item. Here is the full list and location if you need a quick and dirty checklist to ensure you've gotten everything (like I did).
At this time the team has supposedly fixed the bug related to this achievement (counter only increments when opening chests that contain equipment), but beware nonetheless and plan accordingly. The list below recommends saving the chest in the basement of the dorm until after you've obtained the last story related equipment.
UPDATE 4/28/2022: Please also note that there is seemingly a bug with the
ORANG-ISH GLOVES item relating to this item not entering your inventory correctly or at all, so make a save before buying this item. A note regarding this is now listed under Ep. 3 below. Please read the note below for further details.
Please also note that the "Snow Level" item may also be unobtainable after that episode as reported by some users.
List from
https://nightlygamingbinge.com/dodgeball-academia-complete-e...:
*** Spoiler - click to reveal ***Episode 1
Old Gloves
Challenge and defeat Mina as part of the story
Skull Earrings
Library in a chest at the top of the stairs to the left of the librarian
Worn-Out Bandana
Complete the “A Simple Experiment” side quest
Yellow-ish Gloves
Defeat Nino, Cubo and Danny as part of the story
Episode 2
Brand-New Bandage
In a chest in the Infirmary to the right of the nurse
Brand-New Gloves
Complete the “An Unexpected Crisis” side quest
Brand-New Helmet
Purchase from the Dodge Shop for $9.99
Cracked Helmet
In a chest on the southeastern side of the dodgeball courts
Gross Bandage
Purchase from the Dodge Shop for $1.75
Old Shoes
Purchase from the Dodge Shop for $1.59
Pretty Pendant
Defeat the mean trio as part of the story
Worn-Out Socks
Purchase from the Dodge Shop for $6.20
Episode 3
Aero Maxspeed V17
Get an S rank (survive for 60 seconds) on the medium Dodging Challenge
If you’re having problems with this, drop the damage down to 0 in the accessibly settings. This will cause each hit to only deal 1 damage.
Beautiful Pendant
Purchase from the Dodge Shop for $10.45
Big-Sized Gloves
Purchase from the Dodge Shop for $11.50
Ear Buds
Defeat the challenger during “The Daily Challenge” side quest
Embarrassing Underwear
Complete the “A Weird Place for a Game” side quest
Glittery Socks
Get an S rank (survive for 60 seconds) on the hard Dodging Challenge
If you’re having problems with this, drop the damage down to 0 in the accessibly settings. This will cause each hit to only deal 1 damage.
Near-Sighted Reading Glasses
Purchase from the Dodge Shop for $11.50
Orange-ish Gloves*** [Possible bug, please read episode footnote below]
Purchase from the Dodge Shop for $12.00
Pretty Jewel
Purchase from the Dodge Shop for $3.99
Skull necklace
Obtained as part of the story near the end of the episode
Stinky Underwear
Complete the “A Weird Place for a Game” side quest
Tight Underwear
Complete the “A Weird Place for a Game” side quest
Winged Wristband
Complete the “Find the Glasses” side quest
Wisdom Wristband
Complete the “Nature’s Desire” side quest
***per @Kaiteh (thanks!) "My orangish gloves showed up in my equipment as comfy socks, even though I already had comfy socks. The icon and description were correct but the lost name was wrong. Achievement did not pop for me so I must replay it now."
Episode 4
Beautiful Jewel
Purchase from the Dodge Shop for $10.45
Brand-New Bandana
Purchase from the Dodge Shop for $7.00
Brand-New Shoes
Obtained as part of the story
Cheap Wristwatch
Purchase from the Dodge Shop for $4.02
Comfy Socks
In a chest on the roof of the Main Building hidden behind the stairs
Courage Wristband
Purchase from the Dodge Shop for $16.60
Hallway Pass
Obtained as part of the story
Near-Sighted Sunglasses
In a chest on the rooftop of the Main Building
Power Wristband
Purchase from the Dodge Shop for $16.60
Red Ring
Complete the “Keep Your Trade Secrets” side quest
Episode 5
*Note: You can unlock chained chests once Shoy joins the team
AAA Battery
Found in a locked chest in the main area next to the fountain by the western dodgeball courts
Blue Ring
Purchase from the Dodge Store for $16.00
Fancy Wristwatch
Found in a locked chest in the Leisure Area on the bridge leading to the Forest
First-Aid Kit
Found in a locked chest in the Infirmary
Flaming Skull Earrings
Get an S rank on the hard Strength Challenge
If you’re having trouble with this, you can reduce damage to 0 and increase your strength up tp 400% in the accessibility options.
Gorgeous Jewel
Purchase from the Dodge Store for $20.95
Gorgeous Pendant
Obtained as part of the story
Green Ring
Purchase from the Dodge Store for $9.00
Hand Buzzer
Found in a chest at the northwestern part of the Parking Lot
Headphones
Found in a locked chest in the back area of the Lab
Iron Helmet
Found in a chest on the upper level of the Big Tony’s Den
Jalapeno Lipstick
Get an S rank on the medium Strength Challenge
If you’re having trouble with this, you can reduce damage to 0 and increase your strength up tp 400% in the accessibility options.
Laurel Wreath
Purchase from the Dodge Store for $16.00
Mascara De Luchador
Found in a locked chest in the Forest near the entrance to the Deep Woods
Near-Sighted Sports Glasses
Found in a lock chest on the southwestern side of the Dome
Pink Ring
Found in a chest on the roof of a blue card at the southern part of the Parking Lot
Small-Sized Gloves
Found in a locked chest in the back area of the Lab
Yellow Ring
Purchase from the Dodge Store for $16.00
Episode 6
Mystic Scarf
Get an S rank on the hard Defense Challenge
If you’re having trouble with this, you can reduce damage to 0 and increase your strength up tp 400% in the accessibility options.
Near-Sighted Diving Glasses
Get an S rank on the medium Defense Challenge
If you’re having trouble with this, you can reduce damage to 0 and increase your strength up tp 400% in the accessibility options.
Over-the-Top-Armor
Complete the “Underground Tournament” side quest
Red-ish Gloves
Purchase from the Dodge Shop for $26.60
Secret Note
Found in the locked chest in Squid’s camp at the northern part of the Forest
Skull Tiara
Complete the “Daily Challenge” side quest
Spiked Gloves
Purchase from the Dodge Shop for $29.00
Sponge Shield
Obtained as part of the story
Streamer Headphones
Purchase from the Dodge Shop for $27.00
Unattractive Helmet
Purchase from the Dodge Shop for $25.00
Episode 7
A+ Report Card
Purchase from the Dodge Store for $28.00
Cursed Armor
Purchase from the Dodge Store for $33.50
Friendship Bracelet
Complete the “Retrieve the Books!” side quest
Golden Wristwatch
Obtained as part of the story
Purple Ring
Found in a chest on the route to the Radio Tower at Mount Dodji
Episode 8
Golden Bandana
Found in a locked chest in the Dorm’s basement
Leave this chest as your last piece of equipment, in case the equipment list is still bugged.
Lucky Wristband
Complete the “Daily Challenge” quest
Ma’Kako’s Dumbbell
Obtained as part of the story