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Achievements
Bigger, Better, More Badasserer (5): Win 3 chainsaw duels.
Bleep bloop! (10): Get all achievables. Open presents, jump jump, squirtgun fight, kill squid, watch credits.
Game Reviewers Shall Be Pleased (5): Unlock Pretty Princess Difficulty.
I Did Not Use A FAQ For This (10): Collect all Ghost Beads.
In The End I Am Free (25): Beat the game on any difficulty as Yuki.
Lead Dishwasher (40): Beat the game on Samurai difficulty as The Dishwasher or Yuki.
Limb Storm 20XX! (15): Violently separate 100 enemies.
See, I Have Made Them Better (15): Spray three expensive paintings with their owners' blood.
The Disease is Dead (10): Kill Yuki's Demon.
They Totally Chopped My Arm Off (10): Escape from Iffenhaus Space Prison.
Twitch Game Master Extreme Ultra (30): Beat all Arcade levels.
We'll Purge and Purge (25): Beat the game on any difficulty as The Dishwasher.

Achievables Bead
In the first fight of the Marina level, make sure you are playing as Yuki. Use the chainsaw uppercut against an enemy (Down + Y) and a cat's face will appear on screen, like the "Toasty!" appearance from Mortal Kombat. Whle the cat is on screen, press start. You will be teleported to a triple threat boss fight. Defeat the bosses to obtain a present containing the achievable bead. This bead is needed to get the Bleep Bloop achievement.

Achievable Bead: The Marina

Unlockable Gamer Pics
The Dishwasher: Vampire Smile features two unlockable pictures for your profile.

Paka: Complete story mode on Samurai difficulty with Yuki or the Dishwasher.
Vampire Smile: Complete the first level of story mode.

Game info
publisher: Microsoft
developer: Microsoft
genre: Action