The Anniversary Update Title update for Rocket League has 6 achievements worth 250 gamerscore.
Equip a Very Rare Item and complete a game in an Arena with turbulent weather
Score or Assist a combined 30 goals or assists in Casual or Competitive Online matches
Head to Champions Field and complete an Online game
Trade and receive one or more items with another player in a single transaction
Trade In five items of the same quality to receive an item of the next-highest quality
Complete all placement matches in any Competitive Playlist