Here is the full list of all 30 Astalon: Tears of the Earth achievements.
Killed 5000 monsters.
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.
Reached the top of the tower as the Black Knight.
Found the secret ending.
Finished the game with 100% completion.
Purchased all character specific deals in the shop.
Purchased all of Bram's deals in the shop.
Purchased all of Algus' deals in the shop.
Purchased all of Zeek's deals in the shop.
Gathered 100% of the tower's items.
Explored 100% of the tower's rooms.
Completed all entries in the bestiary.
Purchased all of Kyuli's deals in the shop.
Purchased all of Arias' deals in the shop.
Completed 80% of the bestiary entries.
Unlocked the gorgonslayer Bram.
Defeated the Gorgon Gemini.
Collected 50000 orbs.
Defeated the Black Knight.
Defeated the Gorgon Medusa.
Unlocked the collector Zeek.
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.