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.
Reached the top of the tower as the Black Knight.
Found the secret ending.
Defeated the Black Knight as the Gargoyle.
Completed 80% of the bestiary entries.
Completed all entries in the bestiary.
Defeated the Black Knight.
Completed 20% of the bestiary entries.
Completed 50% of the bestiary entries.
Finished the game with 100% completion.
Defeated the Gorgon Medusa.
Explored 100% of the tower's rooms.
Purchased all character specific deals in the shop.
Purchased all of Zeek's deals in the shop.
Purchased all of Bram's deals in the shop.
Purchased all of Kyuli's deals in the shop.
Purchased all of Algus' deals in the shop.
Purchased all of Arias' deals in the shop.
Gathered 100% of the tower's items.
Defeated the Gorgon Solaria.
Collected 50000 orbs.
Unlocked the gorgonslayer Bram.
Defeated the Gorgon Gemini.
Unlocked the collector Zeek.
Killed 1000 monsters.
Collected 10000 orbs.
Defeated the Gorgon Volantis.
Defeated the Gorgon Tauros.