The Guardian Trials Add-on for Super Lucky's Tale has 13 achievements worth 395 gamerscore.
Defeat all of the Levels in Foxington
Complete all Skill Levels
Complete all Combat Levels
Complete all Marble Levels in the Foxington Hub
Find all 4 diamonds in A Road to Nowhere
Collect all of the collectibles during the cross ladder section of Step by Step
Interact with all 5 radios in the Foxington HUB
Die in the Foxington Hub
Take a shower in Foxington HUB
Defeat all of the enemies in Top That!
Never get caught in a single run through of Under Pressure
Take no damage in the WriggleMania
Defeat WriggleMania while wearing the Maxi-Mullet