Here is the full list of all 40 Prince of Persia: The Forgotten Sands achievements worth 1,000 gamerscore.
Knocked down 5 enemies with 1 kick.
Finished off 10 enemies in a row using only the Aerial Slash.
Performed 20 Aerial Slash attacks.
Used aerial kick 15 times.
Purchased every upgrade.
Completed the Enemy Tides Challenge.
Complete the game.
Finished the final battle against Ratash without taking any damage.
Reached the final fight.
We actually have no way of knowing how you found 'em all.
Killed 50 enemies in a row without taking any damage.
Razia becomes part of sword.
Finished 5 titans with the Aerial Slash.
Defeated 50 enemies using the Whirlwind.
Upgraded one power to its highest level.
Defeated 50 enemies using the Ice Blast.
Arrived in Razia's city.
Suffered defeat at Malik's hands.
Defeated 30 enemies using the Power of Flight.
Killed 500 enemies using the sword.
Defeated Ratash?
Defeated Ratash in the Throne Room wihout taking any damage.
Defeated 50 enemies using the Flame Trail.
Defeated 50 enemies while using the Stone Armor.
Used the Power of Time 20 times.
Stayed on solidified water for 1 minute without backtracking using the Power of Time.
Closed the fortress gates.
Wall run for a total of 1/2 mile (805 meters).
Found a sarcophagus.
Used the upgrade menu.
Jumped on 30 enemies in a row.
Saved the Prince's life by using the Power of Time.
Discovered the true nature of Solomon's army.
Broke 100 things. (Feel better?)
Caught up to Malik.
There's no turning back now!
Kicked 20 enemies off of ledges.
Used the finishing lunge 20 times.
Defeated an enemy with a power attack at the end of a combo.
Don't worry. We won't tell if you don't.