Can anybody help me with any of these achievements, please?
Complete all Campaign Acts in 4 player Co-op (any difficulty, Standard or Arcade).
Complete "RAAM's Shadow" in 4 player co-op in either Arcade or Standard mode.
Complete "RAAM's Shadow" in Arcade Campaign on any difficulty.
As Mauler, kill 10 Gears by reflecting their bullets using your shield.
Complete all 50 waves of Horde on any of the Fenix Rising maps.
Complete all 12 waves of Beast on all Fenix Rising maps.
Win a Versus multiplayer match as a team of five Savage Marauders (any mode).
Win a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Complete all 12 waves of Beast on all Forces of Nature maps.
Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.
Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Complete all 50 waves of Horde on any of the Forces of Nature maps.
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
Kill 10 opponents as the leader in a round of Guardian on a Forces of Nature map.
Please get back to me if you either need help yourself or don't mind helping me, cheers!