- Extra weapons in Survival mode
Successfully complete the secret missions in any Survival mode arena to get extra weapons for use in that arena.

- Achievements
Do the following things to obtain the corresponding Gamerscore points:

5 Points
South of Hell	Perform 75 Splatterkills.
Death Came Ripping	Kill an enemy with a Splatter Slash.
Jen Smells of Rot...of the Grave	Re-assemble one of Jen's sexy photos.
Morbid Dismemberment	Kill an enemy with your own dismembered arm.
Razor of Hell	Get 100 kills with Splatter Slash.
Hunger Pangs	Purchase a skill.
Dead on the Rise	Accomplish 5 Secret Missions in a single Survival Arena attempt.
Tongue in Cheek	Kill an enemy with an enemy's head.
Blood and Lightning	Splat 100 enemies on a wall with a weapon.
Army of Dead Evil	Kill 6 enemies within one second.
POW!	Launch an enemy straight up with 'No Head Room'.
Flesh Re-animation!	Regenerate with Splatter Siphon.
You Got Red on You	Splat an enemy on a wall with a weapon.
One Who Slays	Get 300 kills in Berserker Mode.
Brain Dead	Tackle an enemy and pummel it 20 times.
Heavy Frikkin' Metal!	Get 50 kills with non-fleshy weapons.
Headlong into Monsters	Kill 6 enemies in one ram attack.
Barrels of Blood	Get 2000 or more BLOOD Points in one chain of attacks.
Bad Taste	Impale an enemy on a spike.
See you at the Party	Kill an enemy with an enemy's arm.
Must Kill	Kill an enemy with Splatter Smash.
The Business of Killing	Perform a Splatterkill.
Killer of Killers	Get an S-rank in Survival Arena mode.
Audiophile	Listen to all of Dr. West's gramophone records.
Downpour of Blood	Get 100 kills with Splatter Smash.
10 Points
The Blackest of Sundays	Splat 200 enemies on a wall with a weapon.
Too much Horror business	Accomplish all 10 Secret Missions in a single Survival Arena attempt.
None More Dead	Get 150 kills with enemy arms.
The Berserker	Finish Phase 2
Call of the Thule	Unlock 5% of Dr. West's journal.
Boreworm Massacre	Stomp on 1000 Boreworms.
Creepy Show	Re-assemble 8 of Jen's photos.
Vigorous Vengeance	Perform 150 Splatterkills.
Head on Arrival	Get 50 kills with enemy heads.
15 Points
Anvil Horror	Get three S-ranks in Survival Arena mode.
Triumph of Iron	Get 500 kills with non-fleshy weapons.
20 Points
Nightmare in Arkham	Unlock 25% of Dr. West's journal.
Be Garbage of Cesspool	Finish Phase 4
Lovecraft Baby	Unlock 50% of Dr. West's journal.
Happy Ending?	Re-assemble all of Jen's photos.
25 Points
Blood Lust	Unlock 25 skills.
30 Points
Experiment 765	Finish Phase 6
40 Points
Shattered Narcissus	Finish Phase 8
50 Points
Jason Schmason	Get six S-ranks in Survival Arena mode.
Lust for After Life	Unlock all skills.
Pyre for the Damned	Finish Phase 10
100 Points
The House that West Built	Unlock all pages of Dr. West's journal.
Bride of the Corrupted	Finish the game on any difficulty.
120 Points
Dreams of the Dead	Finish the game on 'Brutal' Difficulty.

- Secret missions in Survival mode
Successfully complete the indicated tasks to unlock secret missions in Survival mode:

8. Step on 50 Boreworms.
2. Take no damage for 2 minutes.
6. Kill 50 enemies in Berserk mode.
1. Take no damage for 1 minute.
5. Kill 25 enemies in Berserk mode.
3. Get 5 splatter kills.
7. Step on 20 Boreworms.
4. Get 20 splatter kills.
9. Kill 10 enemies with body parts.
10. Kill 25 enemies with body parts.

- Splatterhouse 2 game
Successfully complete Phase 4: The Meat Factory to unlock the Splatterhouse 2 game.

- Original Splatterhouse game
Successfully complete Phase 2: The Doll That Bled to unlock the original Splatterhouse game.

- Splatterhouse 3 game
Successfully complete Phase 8: Reflections In Blood to unlock the Splatterhouse 3 game.

- Special mask
Successfully complete the game to unlock a special mask for Rick.

- Brutal mode
Successfully complete Story mode on any difficulty to unlock the Brutal difficulty.

- Survival arenas
Successfully complete the game to unlock survival arenas.