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