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