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