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