Complete the game on the hardest difficulty setting.

Unlocked: 12 Sep 2007 10:53:41

Collect or Invent 53 Tonics in the Physical, Engineering and Combat tracks.

Unlocked: 04 Sep 2007 11:46:00

Find every audio diary.

Unlocked: 04 Sep 2007 11:22:24

Acquire all upgrades for all weapons.

Unlocked: 04 Sep 2007 11:01:13

Fully upgrade five weapons.

Unlocked: 04 Sep 2007 10:14:47

Fully upgrade four weapons.

Unlocked: 03 Sep 2007 12:08:16

The player has entered Sander Cohen's personal quarters.

Unlocked: 03 Sep 2007 12:07:13

Fully upgrade three weapons.

Unlocked: 03 Sep 2007 10:14:19

Fully upgrade two weapons.

Unlocked: 02 Sep 2007 08:30:59

Fully upgrade one weapon.

Unlocked: 02 Sep 2007 05:34:49

Acquire at least one weapon upgrade.

Unlocked: 02 Sep 2007 03:56:57

Purchased every slot in all four Plasmid and Tonic tracks

Unlocked: 01 Sep 2007 02:15:31

Complete the game without harvesting any Little Sisters.

Unlocked: 31 Aug 2007 10:02:50

The player has defeated Atlas

Unlocked: 31 Aug 2007 10:02:15

Purchased every slot in one of the Plasmid or Tonic tracks

Unlocked: 31 Aug 2007 09:53:45

The player has become a Big Daddy.

Unlocked: 31 Aug 2007 09:38:23

Either Harvest or Rescue every Little Sister in the game

Unlocked: 31 Aug 2007 09:22:56

Successfully invent at least 100 items.

Unlocked: 31 Aug 2007 09:04:25

Max out all possible research.

Unlocked: 31 Aug 2007 09:01:49

Fully research the Little Sister.

Unlocked: 31 Aug 2007 08:57:14

Fully research the Rosie.

Unlocked: 31 Aug 2007 08:56:40

The player has broken Fontaine's mind control

Unlocked: 31 Aug 2007 08:05:07

Fully research the Nitro Splicer.

Unlocked: 30 Aug 2007 12:09:03

The player has defeated Andrew Ryan

Unlocked: 30 Aug 2007 11:45:29

The player has taken a picture of Sander Cohen's corpse

Unlocked: 30 Aug 2007 09:38:39

The player has completed Sander Cohen's great masterpiece

Unlocked: 30 Aug 2007 09:37:01

Fully research the Bouncer.

Unlocked: 30 Aug 2007 09:21:29

Successfully invented all possible ammo types.

Unlocked: 30 Aug 2007 09:08:08

Take at least one photo in every research group.

Unlocked: 30 Aug 2007 08:46:48

Fully research the Houdini Splicer.

Unlocked: 30 Aug 2007 08:22:13

Fully research the Spider Splicer.

Unlocked: 30 Aug 2007 07:59:36

Hit the jackpot at a slot machine

Unlocked: 29 Aug 2007 11:04:50

The player has restored the forests of Arcadia

Unlocked: 29 Aug 2007 10:54:50

Fully research the Thuggish Splicer.

Unlocked: 29 Aug 2007 10:31:38

Successfully invent at least one item.

Unlocked: 29 Aug 2007 07:47:51

Successfully complete 50 hacks.

Unlocked: 29 Aug 2007 07:38:45

The player has defeated Peach Wilkins

Unlocked: 29 Aug 2007 06:43:26

Fully research the Leadhead Splicer.

Unlocked: 29 Aug 2007 06:41:49

Take a Research Photo of the highest grade.

Unlocked: 28 Aug 2007 12:29:49

Take at least one Research Photo of a Splicer.

Unlocked: 28 Aug 2007 12:17:52

Purchase one slot in any Plasmid or Tonic track

Unlocked: 28 Aug 2007 11:39:38

The player has defeated the crazed Dr. Steinman

Unlocked: 28 Aug 2007 11:04:19

Successfully hack a security camera.

Unlocked: 28 Aug 2007 10:37:37

Successfully hack a safe.

Unlocked: 28 Aug 2007 10:27:44

Successfully hack a vending machine.

Unlocked: 28 Aug 2007 09:44:12

Successfully hack a turret.

Unlocked: 28 Aug 2007 09:39:19

Perform at least one successful hack.

Unlocked: 28 Aug 2007 09:29:23

Successfully hack a security bot.

Unlocked: 28 Aug 2007 09:29:23

Successfully complete the Welcome To Rapture Level.

Unlocked: 28 Aug 2007 09:21:25

Shock an enemy in the water.

Unlocked: 28 Aug 2007 09:08:35

Complete the game on Hard difficulty without using a Vita-Chamber

Unlocked: 17 Mar 2010 15:57:59