The Carnival of Chaos Add-on for Overcooked! 2 has 7 achievements worth 500 gamerscore.
Get 3 stars on all Carnival of Chaos levels
Deliver every type of meal in Carnival of Chaos
Get 3 stars on every level in Carnival of Chaos World 1
Get 3 stars on every level in Carnival of Chaos World 2
Get 3 stars on every level in Carnival of Chaos World 3
Fire a Chef from a Cannon 100 times
Add mustard or ketchup to a recipe 100 times