Here is the full list of all 44 Bakugan: Defenders of the Core achievements worth 1,000 gamerscore.
Won 30 times against the CPU in Battle Arena Mode.
Obtained 250 or more points in a Battle Arena Free For All.
Won five duels against the CPU in Battle Arena Mode.
Obtained 500 or more points in a Battle Arena Destruction Battle.
Defeated Spectra and stopped his evil plans.
Rescued your friend at any cost.
Found a way into Vexos Headquarters.
Defeated Mylene and Shadow at the same time.
Got A rank or higher in twelve Story Mode battles.
Defeated Volt and Lync at the same time.
Built a hologram tower of each attribute.
Defeated Spectra's right-hand man.
Defeated your ultimate foe and paid the ultimate price.
Got to Abyss before the Vexos.
Defeated Lync and stopped the earthquakes.
Purchased all upgrades for six different Bakugan.
Stopped the kidnappers and got Wilda back.
Did all combos on a Bakugan's Combo List in a single battle.
Didn't get fooled by Mylene's tricks.
Picked up all three power-up types in a single battle.
Saved Ingram and Nemus from Lync.
Got B rank or higher in six Story Mode battles.
Got ten items from item boxes.
Earned 100,000 in core energy.
Saved Percival from Volt.
Did twenty or more hits in a single combo.
Joined forces with Ace.
Invented hologram towers and used them to beat the Vexos.
Built a hologram tower.
Saved Elfin from Shadow.
Purchased an upgrade for a Bakugan.
Threw your Bakugan to get an item.
Saved Dan and Marucho.
Destroyed a Vexos crystal in Story Mode.
Followed Dan's instructions.
Deflect an opponent's physical attack 5 times in a single battle.
Do ten combo breakers in a single battle.
Do ten perfect combo breakers in a single battle.
Open each type of Gate card at least once.
Get S rank in every Story Mode battle.
Purchase all upgrades for all Bakugan.
Unlock every Bakugan in the game.
Get every Ability card in the game.
Collect every metal figure in the game.