The Freedom Cry Add-on for Assassin's Creed IV: Black Flag has 6 achievements worth 170 gamerscore.
Kill 5 guards at once with a blunderbuss.
Freedom Cry - Achieve 100% synchronization
Disarm the Gouverneur and kill him with the branding iron.
Freedom Cry - Complete all missions
Liberate 500 slaves.
Free your first slave.