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