Here is the full list of all 24 Soda Dungeon achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete 100% of the bestiary.
Complete dungeon level 1000.
Win a battle by only defending.
Complete dungeon level 750.
Find a legendary item.
Complete 50 levels with only one Soda Junkie.
Complete dungeon level 500.
Inflict burn, sleep, poison, and confusion on one enemy.
Reflect 100 damage from a single attack.
Complete dungeon level 250.
Purchase all basic sodas.
Steal essence from an enemy.
Hope you're hungry.
Have one Knight defend for another Knight.
Sell 100 items.
Complete 100 levels in one trip.
Find a rare item.
Complete dungeon level 100.
Slay 500 enemies.
Complete 50% of the bestiary.
Slay 10 bosses.
Enter a battle in the Arena.
Discover and explore an alternate path in the dungeon.
Complete your first dungeon trip.