Here is the full list of all 30 Astalon: Tears of the Earth achievements.
Unlocked all secrets in the game and beat all the unlockable modes.
Defeated the Black Knight as the Gargoyle.
Reached the top of the tower as the Black Knight.
Killed 5000 monsters.
Purchased all character specific deals in the shop.
Purchased all of Bram's deals in the shop.
Defeated all the bosses in the Boss Rush mode.
Finished the game with 100% completion.
Found the secret ending.
Gathered 100% of the tower's items.
Explored 100% of the tower's rooms.
Completed 20% of the bestiary entries.
Completed 50% of the bestiary entries.
Completed 80% of the bestiary entries.
Defeated the Black Knight.
Defeated the Gorgon Medusa.
Completed all entries in the bestiary.
Purchased all of Zeek's deals in the shop.
Purchased all of Kyuli's deals in the shop.
Purchased all of Algus' deals in the shop.
Purchased all of Arias' deals in the shop.
Defeated the Gorgon Solaria.
Collected 50000 orbs.
Unlocked the gorgonslayer Bram.
Defeated the Gorgon Gemini.
Unlocked the collector Zeek.
Collected 10000 orbs.
Killed 1000 monsters.
Defeated the Gorgon Volantis.
Defeated the Gorgon Tauros.