Achievements
A Hole in your Head (20): Perform 5 headshots in a row with the BIG BONER
Adios George (Beast form) (20): Defeat George Beast Boss
Adios George (Human form) (20): Defeat George Human Boss
An Ordinary Life (15): Story Progression in Act 1 - Chapter 1 (any difficulty setting)
Annoying Mosquito (20): Defeat Elliot Beast Boss
As Evil As Dead (15): Story Progression in Act 3 - Chapter 3 (any difficulty setting)
Blood On The Dance Floor (15): Defeat 10 enemies with the Stomp Attack
Cannibal Carnival (15): Story Progression in Act 2 - Chapter 2 (any difficulty setting)
Demon Hunter (50): Complete all chapters on Medium difficulty setting
Different Perspectives (15): Story Progression in Act 5 - Chapter 2 (any difficulty setting)
Don't Fear the Reaper 1 (20): Defeat Maras Grim (Sister Grim) Boss
Don't Fear the Reaper 2 (20): Defeat Kauline Grim (Sister Grim) Boss
Don't Fear the Reaper 3 (20): Defeat Giltine Grim (Sister Grim) Boss
Drunk in Public (10): Knock back 3 drinks in a row
Fiesta Caliente! (30): Defeat 5 enemies at once using the Hot Boner
Fire in the Hole! (15): Defeat 3 enemies at once using the Barrels of Light
Flat Lust (20): Defeat Justine Boss
Ghost Hunter (15): Story Progression in Act 4 - Chapter 3 (any difficulty setting)
Great Demon World Forest (15): Story Progression in Act 4 - Chapter 4 (any difficulty setting)
Great Demon World Village (15): Story Progression in Act 4 - Chapter 2 (any difficulty setting)
High in Las Vegas (75): Recover all available Red Gems in the game.
I Defeated the Last Big Boss! (20): Defeat Fleming Boss
It's a Bughunt (15): Story Progression in Act 3 - Chapter 1 (any difficulty setting)
Justine For All (15): Story Progression in Act 4 - Chapter 6 (any difficulty setting)
Legion Hunter (100): Complete all chapters on Hard difficulty setting
Lemon Hunter (20): Complete all chapters on Easy difficulty setting
Love Suicide (20): Defeat Paula Boss
Meatballs Lover (15): Defeat 30 enemies with the SKULLCUSSIONER
My Dying Concubine (15): Story Progression in Act 3 - Chapter 2 (any difficulty setting)
Nasty Headache (20): Perform 5 Head Shots in a row with any weapon except Big Boner
Now That's a Big Fuckin' Gun (15): Defeat 40 enemies with the SKULLFEST 9000
Orthodontic Pleasures (15): Defeat 50 enemies with THE DENTIST
Riders of the Lost Heart (15): Story Progression in Act 2 - Chapter 4 (any difficulty setting)
Skullblaster Master (15): Defeat 50 enemies with the SKULLBLASTER
Stingy Bastard (10): Save more than 300 White Gems in your inventory
Suburban Nightmares (15): Story Progression in Act 4 - Chapter 5 (any difficulty setting)
Take Me To Hell (15): Story Progression in Act 2 - Chapter 1 (any difficulty setting)
That's So Hot! (15): Defeat 20 enemies with the HOTBONER
The Big Boner (15): Story Progression in Act 4 - Chapter 1 (any difficulty setting)
The Bird's Nest (15): Story Progression in Act 3 - Chapter 4 (any difficulty setting)
The Castle of Hassle (15): Story Progression in Act 5 - Chapter 3 (any difficulty setting)
The Final Chapter (15): Story Progression in Act 5 - Chapter 4 (any difficulty setting)
The Orthodontist (15): Defeat 30 enemies with the TEETHGRINDER
The Puppeteer (30): Perform a Head Shot right after a Leg Mutilation when the enemy is flying back in the air
The Talkative One (15): Defeat 20 enemies with the TEETHER
Til Death Do Us Part (15): Story Progression in Act 5 - Chapter 5 (any difficulty setting)
Trash'em while they're out! (15): Perform all 5 brutal kills on Normal Demons frozen by the Light Shot
Twelve Feet Under (15): Story Progression in Act 5 - Chapter 1 (any difficulty setting)
What a Wonderful World (15): Story Progression in Act 2 - Chapter 3 (any difficulty setting)
You Go To Hell (5): Start a new game for the first time. (any difficulty setting)

Satanic Hell difficulty [Very Hard]
After beating the game on Legion Hunter [Hard], you will be able to choose the Satanic Hell [Very Hard] difficulty upon starting a new game.