Easy "Back at ya" Achievement...
	Easy "For Honor" Achievement...
	Easy "Status: Poor" Achievemen...
	Various Steam Achievements...

Use Serpent Skin armor and Spike Shield lv6, they both have 50% dmg reflection so you reflect 100% of damage.

Play on "auto" (in the lower right corner it should say "auto on") and equip Knights only. When their hp go down they will defend each other. The achievement pops up when your run ends.

This one is mostly RNG based but there are ways to make it easier for yourself.

Hire 5 Darkmages and equip them with armor that doesn't boost their attack or magic damage a lot. Ex. Serpent Skin or Skeletis.
You must use the Dhronen sword found at lvls 300-400 at the earliest.
Use any shield that beefs up the HP like Armor Shield or Meaty Shield.
Equip Hero's Blood and any damage reduction item to live longer in case of bad RNG.
Run the main dungeon around lvl 500-600, depending on how strong you are or weak the levels will vary.
Don't use auto.
Basically, just melee attack the enemies till they have both burn/sleep then use Noxin until that same enemy receives poison/confused.
Achievement will pop after then dungeon is complete.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A+ for Effort	Complete your first dungeon trip.
All you Need is Soda	Complete 50 levels with only one Soda Junkie.
Back at ya	Reflect 100 damage from a single attack.
Boss Buster	Slay 10 bosses.
Dealmaker	Sell 100 items.
Doesn't Make Sense	Steal essence from an enemy.
Dungeon Pro	Complete dungeon level 750.
Endurance Test	Complete 100 levels in one trip.
Explorer	Complete 50% of the bestiary.
Exterminator	Slay 500 enemies.
For Honor	Have one Knight defend for another Knight.
Fork in the Road	Discover and explore an alternate path in the dungeon.
Gladiator	Enter a battle in the Arena.
Halfway There	Complete dungeon level 500.
Legend has it	Find a legendary item.
Me and Steve	Complete 100% of the bestiary.
More Items Please	Complete dungeon level 250.
Rare Find	Find a rare item.
Status: Poor	Inflict burn, sleep, poison, and confusion on one enemy.
Sugar High	Purchase all basic sodas.
Take the High Road	Win a battle by only defending.
The Legend of Dinner Boy	Unknown.
The Next Dimension	Complete dungeon level 100.
True Warrior	Complete dungeon level 1000.