Full list of all 50 Deadpool achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Scored a combo higher than 40 before they locked the elevators
Defeated Arclight while taking no damage from her slam attacks
Combo-ed an entire wave on any Gold-tier Challenge map
Completed a Gold- or Silver-tier Challenge while countering at least 25 times
Completed "Front Gates of EEEEEEEVIL!" from start to finish using only swords and pistols
Used all three switches, defeated the two phasers, and chased after Vertigo within 60 seconds
Set the Dialog Volume slider to zero
Upgraded all weapons to max
Died 10 times in a row through the floating stairs
Made it across the floating debris without falling
Completed "Landed in Prison" without countering any attacks
In "Genosha," reached the fan girl using only Hammers and Pulse Rifles
Got through Toxic River without falling into or touching the water and taking damage
Shot everything from the Wheel of Insanity (Balloons and the Cow)
Purchased all Player Upgrades
Killed 4 enemies in the Tower Plaza with stealth kills
Got from the studio lobby to the boardroom without dying in 5 minutes
Slapped Wolverine a bunch of times
Completed "Front Gates of EEEEEEEVIL!"
Killed a total of 15 enemies by holding cooked grenades
Completed "The Road to Victory"
Shot up the copier in the bridge offices
Collected all DP points and ammo in the bathroom
Beat "Death, Baby" while wearing the pirate hat
Completed "Death, Baby"
Got a high score at the Carnival
Chose the patience option all the way through the line in the Carnival
Found 11 treasure chests in the darkness of the Tombs
Collected 100 tacos
Completed "Landed in Prison"
Heh heh, good times
Stealth Killed Sinister, in the Prison, with the Sword!
Got a stealth kill with every melee weapon in Sinister’s Lair without being detected
Interacted with all the ladies at the Shower Surprise Party room.
Completed "Genosha"
Played WTF is Cable
Completed "Taking A Chance"
Completed "Job One"
Made a thousand pancakes
Played with Deadpool's junk
Was pretty
Got off your well-toned bottom
Take no damage on the waterslide
Complete the Breach in 10 seconds
Complete "Front Gates of EEEEEEEVIL!" from start to finish without dying
Score a combo of 75 or more while fighting up the stairs at the "Front Gates of EEEEEEEVIL!"
Complete the game on Veteran difficulty
Complete the game on Ultra-Violence! difficulty
Complete five Gold Challenges
Bank a 300-hit combo