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.
Save 10 Followers
Defeat Arachne
Defeat 100 Normal Enemies
Defeat the Cyclops
Defeat the Chimera
Spell 2,500 Words
Use 10,000 Letters
Defeat the Hydra
Defeat the Manticore
Defeat Ladon
Defeat the Calydonian Boar
Unlock 5 Treasure Chests
Defeat the Nemean Lion
Kill an enemy with exact damage
Max out an ability
Defeat the Sphinx
Defeat Cerberus
Spell a 7 Letter Word
Defeat Medusa
Spell a word with 3 or more Special Tiles
Beat All Typing Levels
Reach the Max Level
Save a follower with no incorrect guesses
Beat All Levels
Earn 500,000 Gold
Defeat the Minotaur
Defeat Lycaon
Defeat Lamia
Defeat Typhon
Defeat Echidna