ok i have this for the PC and beat it... is it any different? and what kinda of achievments are i looking at on the 360?

There are some new weapons.

As for acheviements

Achievements

Survivalist 150
Complete the Campaign on any difficulty without dying.

Fearsome 100
Complete the Campaign on Extreme difficulty.

No Juice 65
Complete the Campaign on any difficulty without using any boosters.

Real Time 65
Complete the Campaign on any difficulty without using SlowMo.

Fearless Flagman 75
Successfully capture 50 flags in ranked CTF or SlowMo CTF games.

MP 1000 75
Participate in 1000 ranked Multiplayer games of any type.

Multiplayer Victory 75
Win any ranked Deathmatch, SlowMo Deathmatch, or Elimination Multiplayer game.

Fearless 35
Win the Campaign on any difficulty except Low.

Explorer 35
Find every Health Booster and Reflex Booster in the single player campaign.

Exterminator 35
Kill every enemy in the Campaign.

Ammo Hog 35
Win the Campaign using less than 500 rounds of ammo.

No Fear 35
Win every Instant Action map on Extreme difficulty.

Demolitions Expert 35
Kill 200 enemies with the N6A3, AT-S or M77 in any ranked Multiplayer games.

Dead Eye 35
Kill 150 enemies with Headshots in any ranked Multiplayer games.

Initiation 5
Complete Interval 2 in the Campaign.

Water Treatment Facility 5
Complete Interval 3 in the Campaign.

Armacham 5
Complete Interval 7 in the Campaign.

Slums 5
Complete Interval 8 in the Campaign.

Secret Facility 5
Complete Interval 10 in the Campaign.

Intel 5
Gather every phone message and lap top in the Campaign.

Explosives Expert 5
Kill 3 or more enemies with a single N6A3, AT-S or M77 in the Campaign or Instant Action.

Environmentalist 5
Kill 10 enemies with barrels, fire extinguishers or fuse boxes in the Campaign or Instant Action.

Slow Jo 5
Kill 5 enemies with one SlowMo use in the Campaign or Instant Action.

Medic! 5
Use 50 Medkits in the Campaign or Instant Action.

Bullet Sponge 5
Use 50 armor vests in the Campaign or Instant Action.

Feared 5
Complete every Instant Action map on any difficulty except Low.

Team Victory 5
Win 5 each of ranked CTF, SlowMo CTF, TDM, SlowMo TDM, and Team Elimination games in Multiplayer.

MP 100 5
Participate in 100 rank Multiplayer games of any type.

Assaulter 5
Kill 50 enemies with the G2A2 in any ranked Multiplayer games.

Sub-Jugator 5
Kill 50 enemies with the RPL in any ranked Multiplayer games.

Dual Machinist 5
Kill 50 enemies with the SM15 in any ranked Multiplayer games.

Repeating Offender 5
Kill 50 enemies with the MP-50 in any ranked Multiplayer games.

PumpShotty Ownage 5
Kill 50 enemies with the VK-12 in any ranked Multiplayer games.

Grenadier 5
Kill 50 enemies with the N6A3 in any ranked Multiplayer games.

Rocketman 5
Kill 50 enemies with the MOD-3 in any ranked Multiplayer games.

Perforator 5
Kill 50 enemies with the 10mm HV Penetrator in any ranked Multiplayer games.

Pistoleer 5
Kill 50 enemies with the AT-14 in any ranked Multiplayer games.

Disintegrator 5
Kill 50 enemies with the Type-7 in any ranked Multiplayer games.

Trap Layer 5
Kill 50 enemies with the AT-S in any ranked Multiplayer games.

Sapper 5
Kill 50 enemies with the M77 in any ranked Multiplayer games.

Sniper 5
Kill 50 enemies with the ASP in any ranked Multiplayer games.

Brawler 5
Kill 50 enemies with Punches or Rifle Butts in any ranked Multiplayer games.

Black Belt 5
Kill 50 enemies with Round House Kicks, Flying Kicks, or Slide Tackles in any ranked MP games.

Belly Gunner 5
Kill 50 enemies with the turret in any ranked Multiplayer games.

Secret Achievement 0
Continue playing to unlock this secret achievement.

Secret Achievement 0
Continue playing to unlock this secret achievement.

Secret Achievement 0
Continue playing to unlock this secret achievement

yes, its different.

I think that Zorravin kinda made that clear