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