Here is the full list of all 24 Eldrador Creatures achievements.
Liberate your homeworld from enemies.
Take over an enemy world.
Take over a second enemy world.
Take over a third enemy world.
Fight your way to the Superweapon.
Earn a new creature.
Earn all creatures of one faction.
Unlock a creature's passive skill.
Unlock a creature's special skill.
Unlock a creature's maximum upgrade.
Earn 100 Mini Creatures.
Get a golden Mini Creature.
Use every Mini Creature skill once in the course of one battle.
Regroup your team of creatures.
Destroy 30 objects using your creatures.
Use a creature's special skill.
Use your creatures' special skills 50 times.
Defeat an enemy creature via a counterattack.
Defeat an enemy creature via barbs in the ground.
Defeat 4 enemy creatures in one battle using the same creature.
Heal your creatures 20 times.
Complete 10 different battles with a 3-star rating.
Complete 20 different battles with a 3-star rating.
Complete 30 different battles with a 3-star rating.