Here is the full list of all 21 CreaVures achievements.
Collect 25 essence
Collect 100 total motes
Hit an enemy outside the field of view with Pokey.
Meet Pokey.
Meet Zappy.
Meet Rolly.
Meet Glidey.
Defeat Goliath Trout.
Defeat Falcon Elm.
Bite the following NPCs: bird, bat, squirrel, reptile, frog, monkey
Zap yourself in water.
Collect 250 total motes
Collect 500 total motes
Collect 750 total motes
Collect 1000 total motes
Collect 1250 total motes
Collect all the motes
Collect 50 essence
Collect 100 essence
Collect 150 essence
Collect all the essence.