The Fowl Tempered Pack Add-on for Angry Birds Trilogy has 10 achievements worth 250 gamerscore.
Complete Classic Episode 8 (without the Mighty Eagle)
Complete Classic Episode 9 (without the Mighty Eagle)
Complete Seasons Episode 13 (without the Mighty Eagle)
Complete Seasons Episode 14 (without the Mighty Eagle)
Complete Seasons Episode 15 (without the Mighty Eagle)
Get 3 stars in every single level of Fowl Tempered
Get 100% Eagle score in every single level of Fowl Tempered
Smash 1000 Ghost Blocks
Spawn 500 bubbles with Pink Bird
Collect all Golden Wrenches in Classic Episode 8