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