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