The Pure Time Trials Add-on for Mirror's Edge has 6 achievements worth 250 gamerscore.
Attain a Time Trial star rating of 90. [Pure Time Trials]
Attain a Time Trial star rating of 75. [Pure Time Trials]
String together: wallclimb, turn, swing, wallclimb, turn, swing, jump. [Pure Time Trials]
String together: springboard, wallrun, turn, swing, jump. [Pure Time Trials]
String together: slide, wallrun, wall climb, turn, jump. [Pure Time Trials]
String together: wallrun, wallrun, turn, swing, jump. [Pure Time Trials]