The Surf 'n' Turf Add-on for Overcooked! 2 has 7 achievements worth 500 gamerscore.
Get 3 stars on all Surf 'n' Turf levels
Deliver every type of meal in Surf 'n' Turf
Get 3 stars on every level in Surf 'n' Turf World 1
Get 3 stars on every level in Surf 'n' Turf World 2
Get 3 stars on every level in Surf 'n' Turf World 3
Wash 150 dirty plates or glasses with the water gun
Use the Bellows on BBQs 500 times