Here is the full list of all 13 WWE 2K BATTLEGROUNDS achievements.
Fill the crowd bar
Perform 20 taunts
Perform a pin successfully
Perform 20 signature moves
Control the ram and feed your opponent to the alligator
Unlock the "Thunderstorm" Power Up
Complete the WrestleMania event
Unlock the Everglades battleground
Win a Gauntlet match against 5 opponents or more
Win a Steel Cage match
Win a Royal Rumble match with 20 opponents
Pick up a motorcycle and a turnbuckle
Win a Royal Rumble match against 30 opponents in medium difficulty or higher