Single-Player Achievements
Play a Single-Player game without any in-game codes and accomplish a certain task to unlock these achievements for Gamerscore points.
Unlockable How to Unlock
Untouchable - 10 points Complete level with no damage taken
Private-Act 1 - 15 points Complete Act 1 with rank of Private
Private-Act 2 - 20 points Complete Acts 1 and 2 with rank of Private
Private-Defeated the Strogg - 25 points Complete the game with rank of Private
Corporal-Act 1 - 25 points Complete Act 1 with rank of Corporal
Corporal-Act 1 - 25 points Complete Acts 1 and 2 with rank of Corporal
Corporal-Defeated the Strogg - 30 points Complete the game with rank of Corporal
Lieutenant-Act 1 - 25 points Complete Act 1 with rank of Lieutenant
Lieutenant-Act 2 - 25 points Complete Acts 1 and 2 with rank of Lieutenant
Lieutenant-Defeated the Strogg - 30 points Complete the game with rank of Lieutenant
General-Act 1 - 25 points Complete Act 1 with rank of General
General-Act 2 - 25 points Complete Act 2 with rank of General
General-Defeated the Strogg - 30 points Complete the game with rank of General
Full Arsenal - 20 points Landed a shot from every weapon
Blaster Master - 15 points Completed a level using only the blaster
Blazing Buckshot -15 points Completed a level using only the shotgun
The Machine - 15 points Completed a level using only the machine gun
Pineapple King - 15 points Completed a level using only the grenade launcher
Hyperactive - 15 points Completed a level using only the hyper-blaster
Tooth and Nail - 15 points Completed a level using only the nailgun
Ballistics Expert - 15 points Completed a level using only the rocket launcher
The Sniper - 15 points Completed a level using only the railgun
The Dark Lord - 15 points Completed a level using only the dark matter gun
Enlightening - 15 points Completed a level using only the lightning gun
Solar Star of Courage - 20 points Finish the level with helping the Viper Squad
Sky Marshall's Medal of Valor - 20 points Rescue PVT Lanier of Eagle Squad
Galactic Order of Heroism - 20 points Finish the level with helping the Raven Squad

Permanent Effect of Boots of Springheel Jak
First you must have completed the Thieves Guild quests without destroying the Boots of Springheel Jak. In order to do that you must simply survive a small fall near the end of the last quest with the boots unequipped.
After that go to the Shrine of Sanguine and get the quest there. Follow what the quest tells you to do and when you cast the spell, guards will try and arrest you. Get arrested. (Don't worry, all your equipment is in a chest at the Shrine of Sanguine, so you shouldn't lose anything.)

After you serve your time, you should have the Boots of Springheel Jak in your inventory. If you try to equip them, it will say "You can not equip this enchanted item at this time." But if you check your Active Effects page under Fortify Acrobatics, it should say that you still have the boost from the boots. You can also feel free to equip any other boots as well.

Item Dupe
1)Equip ANY set of arrows.
2)Draw your bow back,while its drawn back press B to go to your inventory screen.

3)Click on any other set of arrows you own and press A twice.

4)Now find an item you wish to clone and drop it.