Finding the Garden of Eden

 is a Fallout 3 quest. It is also an Xbox 360 and PC achievement.

Walkthrough
For Project Purity to function properly, you must acquire a Garden of Eden Creation Kit. There is only one in the game, inside Vault 87. Naturally the vault is filled with hostile super mutants and deadly radiation. Scribe Rothchild initially directs you to the approximate location of the vault, although he warns the player of the life threatening radiation found at the entrance. He is not joking, there is no way to get close to the entrance of Vault 87 without being killed by very high levels of radiation (even with rad resistance maxed out, you still die). Rothchild suggests that the player enter Little Lamplight, to search for an alternative route into the vault.

When the player discovers Little Lamplight, he is immediately approached by an adult-wary Mayor MacCready, who will begrudgingly grant the player safe passage with adequate charisma. Otherwise, the player must do a quest for the Mayor, freeing three children from the slavers at Paradise Falls. With the children freed, the player can now enter Little Lamplight.

The player must speak with the Mayor and navigate a conversation tree in order to gain permission to open the gate that leads to Murder Pass. Once permission has been recieved, the player should proceed to Murder Pass, whereupon Princess opens the gate, thus allowing the player to enter Vault 87. If the player chooses to go through the Murder Pass, he will subsequently battle his/her way through the bloody, derelict halls of the vault against hordes of Super Mutants.
 * Alternatively, instead of entering through Murder Pass, the player can talk to Joseph, who will activate the terminal and allow you to guess the password. If the player has high enough computer skills they can hack the door and enter Vault 87, bypassing all of Murder Pass, and entering the vault's Reactor Chamber. However, if the door to the reactor room is opened, the player can no longer open the door to Murder Pass by talking to Princess.
 * The player can still clear out Murder Pass by turning right at the first T-intersection and exiting the Reactor Chamber though another door.

Both paths lead to the Reactor Chamber, which leads to the Living Quarters, then the Test Labs. The Player will eventully encounter a literate female Super Mutant named Fawkes who asks to hold a conversation with the player over the intercom. If the player agrees, Fawkes will explain her upbringing in the vault, and how she became literate and civilized through continued access to the vault's database. Fawkes promises to retrieve the Garden of Eden Creation Kit from the irradiated halls above if she is released. The radiation level where the G.E.C.K. is stored is extremely high. The player can precede in one of three ways:
 * Attempt to get the G.E.C.K. without help.  If the player chooses to retrieve the G.E.C.K. alone, he/she will need about 10 Radaway and a good set of armor with at least 20 RAD protection to survive the radiation inside the G.E.C.K. room.
 * If the player is accompanied by Charon, he will willingly retrieve the G.E.C.K. as well.
 * Release Fawkes, who will assist the player in both combat and obtaining the GECK, thus fulfilling the objective of the quest. You can release Fawkes in one of four ways:
 * Unlock Fawkes' room by picking the Very Hard lock on the door.
 * Unlock Fawkes' room by hacking the Hard locked computer console next to her door.
 * Go down the hall to your right, past 2 Centaurs and into a maintenance room with 2 Super Mutants. Here you will find the Fire Control Console.  Next to it is an Average locked computer console that can release individual cells.  Fawkes' cell is number 05.
 * Activate the Fire Control Console, thus releasing Fawkes and every other inhabitant of the other locked cells.

The rooms contain...
 * Room 01 - 3 dead people (2 Wastelanders and 1 Raider)
 * Room 02 - vacant
 * Room 03 - The only "dangerous" test subject, a nutty human named Sid in room 3. He may be friendly if you have not unlocked all the rooms, but will turn hostile once all doors have been unlocked.  If you approach him while he's still friendly, you can try to talk to him, but he just says 'Get out of my head!  Get the fuck out!  Arrg!'
 * Room 04 - vacant
 * Room 05 - Fawkes

The room with the G.E.C.K. can be found by going left from Fawkes' cell. If you release her, she'll lead you to it, and will engage the remaining enemies in melee. It is likely that, at this point, Fawkes is essential, and as such, cannot die. It is unknown whether she even takes damage, and if so, if she can be knocked unconscious.

Unfortunately, even after all this effort, the player will be incapacitated upon attempting to leave the vault by a contingent of Enclave soldiers and the G.E.C.K. will be taken from the player.