The AquaDome Title update for Rocket League has 7 achievements worth 250 gamerscore.
Make 535 Shots on Goal
Activate every power-up in Rocket League® Rumble
Freeze an opponent's shot before it can score
Equip the Bubbles Rocket Trail and Score an Aerial goal, while playing in AquaDome
Head to AquaDome and score a goal while flipped on your back
Score a Goal, Save a shot, and Assist a teammate in a single game
Win the MVP award in a game that goes to overtime