Here is the full list of all 24 God Mode achievements.
Kill 25 000 creatures
Finish any map with 6 active Oaths on hardest difficulty
Complete any map on Platinum difficulty
Complete all maps on hardest difficulty
Destroy 50 scarab eggs before they hatch
Survive the "Death" Test of Faith
Grind 50 creatures using the Buzzsaw melee attack
Kill 20 creatures using the Hammer ability
Purchase all upgrades
Buy Super Pants
Collect 5 000 000 unspent gold
Trigger 20 Mage seals
Reach the final level and attain God Mode
Enrage 10 Cyclops
Kill 2500 creatures
Fully upgrade one weapon
Kill 50 enemies using melee
Decapitate 100 Skeletons
Complete any map without dying
Purchase your first weapon upgrade
Complete your first Oath
Finish any map with 3 or more active Oaths
Finish any map on any difficulty
Kill 100 creatures