BioShock

In my opinion, this is the hardest achievement in the game with the smallest margin for error. I used nekov4ego’s video (posted below) in order to guide me through this achievement. You will need to abuse the manual save system for every arena of this Challenge Room. I would run each arena several times in order to try and improve on nekov4ego’s time if possible. I could shave a few seconds off here or there, but there were several rooms that I could not beat his time on after multiple tries. I ended up beating the room with a time of 14:40 which was 27 seconds slower than nekov4ego. The “All Kinds of Big Daddies” area is very unpredictable and always costs me more time than nekov4ego since he aces that room. Please follow nekov4ego’s text and video guide.

• Difficulty: Medium (this is the minimum setting that you can use for this achievement)
• Weapons: Wrench, Crossbow, Camera
• Plasmids: Electro Bolt 3
• Tonics: Damage Research, Wrench Jockey, Armored Shell, Eve Saver

Single Splicer: Just run to the arena as soon as you start off and kill the Splicer with the wrench and quickly make a manual save at the Little Sister vent. The exit is on your left. Use the Power to the People station to upgrade your Crossbow.

Single Big Daddy: Run up to the Power to the People station to apply the second upgrade to your Crossbow BEFORE you fire at the Big Daddy, unlike what nekov4ego did. Take a photo or a few for the damage bonus. Then 2-3 Crossbow bolts should be enough to kill the Big Daddy.

Houdini Splicers: At this point you should have Damage Research, Wrench Jockey as well as Electro Bolt 3. Take picture of the first Splicer you see for the damage bonus and then run down the stairs taking shortcuts where possible (try not to drop and die). Use Electro Bolt + Wrench to one-hit kill all the splicers as they appear.

Security Turret Maze: Use the Crossbow to one-hit kill all of the Turrets. Try to do it in order and don't miss the flamethrower ones as they are hidden well between the walls. Use Electro Bolt + Wrench for the Splicers. You can take care of the Big Daddy using the Crossbow as well. Don't forget to pick up any bolts you see on your way so that you don't run out of ammo!

All Kinds of Enemies: Use Electro Bolt + Wrench for the Splicers and the Crossbow for the Big Daddy. Keep the Big Daddy for last after you have made sure the Splicers have been taken care of.

Security Bots: Turn right, left, right, right (past the Big Daddy), then proceed after the Health Station and use Electro Bolt + Wrench to kill the Splicer and disable the Security Bots. Then use the Crossbow to kill the Big Daddy and proceed.

Spider Splicers: Take a few pictures for extra damage and use Electro Bolt + Wrench or the Crossbow to kill all of the Spider Splicers in the arena. If you get any at the center of the ceiling, electrocute them so they fall in the water for quick kill from a distance.

All Kinds of Big Daddies: Take photos of them before you attack for a potential Wrench Jockey 2 and increased damage. Try to trick the Big Daddies to fight each other and take them out with the Crossbow while they are busy. You can also use the Grenade Launcher if you run out of bolts.

Final Wave: As soon as you exit, head for the Little Sister at the door and activate the final wave. Use Electro Bolt + Wrench on the Splicers as they appear and then take the Big Daddy with the Crossbow as usual. Run to the Little Sister and wait for her to ... slowly ... open ... the door--as your time runs out.

If you rescue the Little Sister before the 15-minute mark, you'll unlock the achievement. Good luck!