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