Full list of all 12 BloodBath achievements worth 1,000 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox 360.
Reach PITDOG Rank 5
Reach PITDOG Rank 10
Reach PITDOG Rank 15
Reach PITDOG Rank 20
Reach PITDOG Rank 25
Win a Domination match
Win a The Wagon match
Win a Judgement match
Win a BloodBath match
Get 100 kills
Perform 10 Takedowns
Perform 10 Power Hits