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