The The Lost Archive Add-on for Assassin's Creed: Revelations has 10 achievements worth 250 gamerscore.
Land on a block after falling more than 25 meters
Take the induction leap of faith
Reach the Animus memo
Enter the Animus simulation
Finish memory five
Experience the loop
Find all decipher fragments
Break the loop, escape the cycle
Complete the Animus testing sequence without failing
Make it across the river Styx without failing