Here is the full list of all 21 Outrealm achievements.
Beat the game in under 40 mins on Expert mode.
Warp 200 enemies with the Jewel of the Abyss.
Throw 400 Axes.
Collect 25 different items in one game.
Beat the game with every character.
Deflect 100 enemy projectiles.
Spawn 1000 Flesh Buds.
Score 20 Critical Hits in a row with Pierce.
Beat the game.
Ignite 750 Explosions with Dynamite.
Place 400 Volcanic Totems.
Smash 500 frozen enemies with Shatter.
Loot 400 items.
Recover a total of 20,000 Health.
Collect five of the same item in one game.
Block 5000 Damage with the Iron Ball.
Stun 350 enemies with Flare.
Inflict 1000 Damage in a single blow.
Block a hit that would otherwise kill you.
Launch 500 Enchanted Arrows.
Complete the Monster Log