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