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