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