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 met with 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 then proceeds to Murder Pass, whereupon Princess opens the gate,thus allowing the player to enter Vault 87. The player will subsequently battle his or her way through the bloody, derelict halls of the vault against hordes of Super Mutants. A literate Super Mutant, Fawkes, asks to hold a conversation with the player over the intercom. If the player agrees, Fawkes will explain his upbringing in the vault, and how he 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 he is released. The player can either opt to leave Fawkes and see how he fares against even more mutants and radiation, or activate the fire alarm, thus releasing Fawkes and other experiments. There is also a medium difficulty terminal in the office which can be hacked, where you can release individual test subjects without releasing all of the mutants. Fawkes's cell is number 5. Fawkes will assist the player in both combat and obtaining the GECK, thus fulfilling the objective of the quest.

However, the player is incapacitated upon attempting to leave by a contingent of Enclave soldiers and the GECK is taken from the player.