The Revenge of the Battle-Cars Add-on for Rocket League has 5 achievements.
Use the Accelerato Boost with an original Battle-Car while playing in a SARPBC-inspired arena
Win a game against All-Star Bots with the Hearts Decal equipped
Equip the Shark Fin Topper and win an Unfair Bot Match
Win an Online Match with Scarab or Zippy
Win the MVP award using Scarab or Zippy