Here is the full list of all 18 The Excrawlers achievements.
Defeat Maduk
Find T-1 & S-2
Find Holeyd
Find the Gribster
Burn the web
Find a Restorer
win 10 arenas
Find the Lesovick
Collect 20 gems
Reach Level 10
Use 5 skill points
hit all the targets in the level
Burn the ogre camp
Find the secret place in the forest
Improve the gem
Find Tarik's Gunpowder
Complete the tutorial
Perform a combo of 20+ hits without taking damage