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