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