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Alternate endings
There are six alternate endings: rise to surface (good and evil), abandoned (good and evil), and the standard ending (good and evil).
Good endings Rescue all Little Sisters that you dealt with and spare Grace Holloway, Stanley Poole, or Gilbert Alexander.
Good endings Rescue all Little Sisters That you dealt with and kill Grace Holloway, Stanley Poole, and Gilbert Alexander.
Standard endings Rescue at least one Little Sister and harvest at least one Little Sister. Choose to die at the end and spare Grace Holloway, Stanley Poole, and Gilbert Alexander.
Standard endings Rescue at least one Little Sister and harvest at least one Little Sister. Choose to die at the end and kill Grace Holloway, Stanley Poole, or Gilbert Alexander.
Bad endings Rescue at least one Little Sister and harvest at least one Little Sister. Choose to live at the end and spare Grace Holloway, Stanley Poole, and Gilbert Alexander. Alternately, harvest all Little Sisters that you dealt with and spare Grace Holloway, Stanley Poole, and Gilbert Alexander.
Bad endings Rescue at least one Little Sister and harvest at least one Little Sister. Choose to live at the end and kill Grace Holloway, Stanley Poole, or Gilbert Alexander. Alternately, harvest all Little Sisters that you dealt with and kill Grace Holloway, Stanley Poole, or Gilbert Alexander.
Defeating Rumblers
When fighting a Rumbler (Big Daddy with rockets), use Telekinesis to grab the rockets it fires and throw them back at it.
Free Telekinesis
Use the following trick to pull normal items toward you with Telekinesis and not use any Eve. Eve is only used when you release the button to throw an item with Telekinesis. Use Telekinesis to pull items such as ammunition or first aid kits toward you to collect without wasting any of your Eve. If you take an item you are already maxed out of, you will either be stuck holding it with Telekinesis or have to release the button to throw it and use some Eve. However, if you display the Plasmid wheel and select another Plasmid attack, you can release the button to drop the item without Telekinesis automatically throwing it. Thus, you will not use any Eve by dropping an item you cannot carry. This can also be used when pulling electrified trip wires out of walls. To do this, pull the item toward you with Telekinesis, and without releasing the trigger, display the Plasmid wheel to select another plasmid. When you close the Plasmid wheel and release the trigger, you will drop the item.
Help from Security Bots
Hack Security Bots when they appear after an alarm is triggered. They will remain in the area and fight for you. Note: Try stunning them with an electric attack first. There is an easy way to collect Security Bots to fight with you. First, locate a Bot Shutdown Panel that is quickly accessible near a vending machine. Hack the vending machine, but stop the pointer on the red to activate the Security Bots to come for you. Quickly run to the Bot Shutdown Panel and throw the switch. Then, locate a deactivated Security Bot and hack it. That Bot is now aiding you. Note: You can only have two Security Bots aiding you at one time.Achievements
| Unlockable | How to Unlock |
|---|---|
| "Mr. Bubbles-- No!" (20) | Take down your first Big Daddy in a non-private match. |
| 9-Irony (5) | Paid your respects to the founder of Rapture. |
| Adopted a Little Sister (5) | Adopted a new Little Sister for the first time. |
| Against All Odds (30) | Finish the game on the hardest difficulty level. |
| All Plasmids (20) | Find or purchase all 11 basic Plasmid types. |
| All Weapon Upgrades (20) | Find all 14 Power to the People weapon upgrades in the game. |
| Big Brass Balls (25) | Finish the game without using Vita-Chambers. |
| Big Spender (15) | Spend 2000 dollars at Vending Machines. |
| Bought a Slot (5) | Buy one Plasmid or Tonic Slot at a Gatherer's Garden. |
| Choose the Impossible (50) | Achieve Rank 40. |
| Confronted Grace (10) | Confronted Lamb's lieutenant in Pauper's Drop. |
| Counterattack (5) | Killed an enemy with its own projectile. |
| Daddy's Home (10) | Found your way back into the ruins of Rapture. |
| Dealt with Every Little Sister (50) | Either Harvest or Save every Little Sister in the game. |
| Defeated the Preacher (20) | Defeated the Preacher. |
| Disgusting Frankenstein (10) | Become a Big Daddy for the first time in a non-private match. |
| Distance Hacker (5) | Used the Hack Tool to hack an object at a distance. |
| Escape (100) | Escaped Rapture. |
| First Research (5) | Research a Splicer with the Research Camera. |
| Found Lamb's Hideout (20) | Gained access to Lamb's stronghold. |
| Fully Upgraded a Plasmid (10) | Fully upgrade one of your Plasmids to the level 3 version at a Gatherer's Garden. |
| Fully Upgraded a Weapon (10) | Install the third and final upgrade to any of your weapons. |
| Grand Daddy (25) | Defeat 3 Big Daddies without dying during the fight. |
| Heading to the Surface (25) | Headed to the surface on the side of Sinclair's escape pod. |
| Little Moth (20) | Achieve Rank 20. |
| Look at You, Hacker (15) | Killed 50 enemies using only hacked Security. |
| Man About Town (10) | Play at least one non-private match on each multiplayer map. |
| Master Gatherer (30) | Gather 600 ADAM with Little Sisters. |
| Master Hacker (20) | Hack 30 machines at a distance with the Hack Tool. |
| Master Protector (15) | Get through a Gather with no damage and no one getting to the Little Sister. |
| Max Plasmid Slots (10) | Fully upgrade to the maximum number of Plasmid Slots. |
| Mother Goose (20) | Save your first Little Sister in a non-private match. |
| Nose for News (20) | Uncovered the secret of Dionysus Park. |
| One Research Track (20) | Max out one Research Track. |
| Parasite (10) | Achieve Rank 10. |
| Prolific Hacker (20) | Successfully hack at least one of every type of machine. |
| Protector (20) | Defended yourself against Lamb's assault in the train station. |
| Proving Grounds (20) | Win your first non-private match. |
| Rapture Historian (40) | Find 100 audio diaries. |
| Research Master (20) | Max out research on all 9 research subjects. |
| Reunion (50) | Reunited with your original Little Sister. |
| Savior (25) | Saved every Little Sister and spared Grace, Stanley and Gil. |
| Sinclair's Solution (20) | Joined forces with Sinclair in Ryan Amusements. |
| Skin Job (20) | Achieve Rank 30. |
| Trap Master (15) | Kill 30 enemies using only Traps. |
| Two-Bit Heroics (10) | Complete your first trial in a non-private match. |
| Unbreakable (20) | Defended yourself against the Big Sister without dying. |
| Unnatural Selection (10) | Score your first kill in a non-private match. |
| Upgraded a Weapon (10) | Upgrade any weapon at a Power to the People Station. |
| Welcome to Rapture (10) | Complete your first non-private match. |
