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