Here is the full list of all 30 God of Word achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Spell 2,500 Words
Beat All Levels
Defeat Typhon
Use 10,000 Letters
Reach the Max Level
Beat All Typing Levels
Defeat Echidna
Earn 500,000 Gold
Defeat the Minotaur
Save 10 Followers
Save a follower with no incorrect guesses
Defeat Lycaon
Defeat Lamia
Defeat Arachne
Defeat 100 Normal Enemies
Defeat the Cyclops
Defeat the Chimera
Defeat the Hydra
Unlock 5 Treasure Chests
Defeat the Manticore
Defeat Ladon
Defeat the Calydonian Boar
Defeat the Nemean Lion
Spell a 7 Letter Word
Max out an ability
Defeat the Sphinx
Defeat Cerberus
Kill an enemy with exact damage
Defeat Medusa
Spell a word with 3 or more Special Tiles