Full list of all 30 Bellator: MMA Onslaught achievements worth 400 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Finished Tournament Mode
Played Tournament Mode
Achieve Maximum Level with Custom Fighter
Performed 25 Throw KOs
Performed 25 Kick KOs
Won a SuperFight Match
Played using every official Bellator Fighter
Completed a Challenge
Unlocked All Throw Skills
Unlocked All Striking Skills
Unlock All Technical Skills
Unlock All Submission Skills
Performed 25 Punch KOs
Performed 25 Parries or Counters
Won 25 Fights By Submission
Win 10 Ranked Matches With Boosts
Play a Ranked Match in Every Arena
Won 5 Ranked Matches in a Row
Got S Grade in a Ranked Match
Won a Ranked Match Without Being Thrown
Won a Ranked Match Without Being Clinched
Won a Ranked Match Without Being Taken to the Ground
Won a Ranked Match
Defeated Opponent in under 20 Seconds in a Ranked Match
Won a Ranked Match Without Being Hit by a Strike
Played a Ranked Match
Applied a Boost
Played a Player Match
Used The Move Editor
Created Custom Fighter