As a player improves in his/her gameplay 'Achievements' are available and achieving these gives a player 1 of 50 available in the game.
Reference stats table.
All multiplayer maps (preorder).
Distinctive number '6' marking on head.
6 tries escaping as a Chest Burster but is controlled and put in a 'program', from here gameplay commences for single player. As part of single player gameplay instructions are given as if a command for the Queen, which will direct the character through the areas. Following these commands a player will control the character through the levels Research Lab, Colony, Refinery, Jungle and Ruins which ultimately culminates in Number 6 releasing the Queen.
At the end of gameplay Number 6 starts mutating into a Praetorian as the Queen is killed by the Rookie and then later still mutates into a Queen (a different Queen that was released by Number 6 and different then killed by Rookie and Praetorian killed by Dark in their game but after gameplay in single player is complete).
When 6 was captured it was starting to change into a Queen and this occurs when aboard Weyland's craft in the last end credits after having killed the synthetics that captured her and brought her aboard.
It is unclear how many Xenomorphs are breed by Weyland and Dr.Groves but 'Number 6' gets the no.'6' marking. 6's development is different from Aliens in films and so this xenomorph will develop through different stages with a comparable with the game Aliens: Colonial Marines.
Number 6 appears in the game Aliens v Predator 3 along with the Warrior Ridged and Warrior, they are similiar to the Xeno Soldiers that appear in the game Aliens: Colonial Marines and are similiar to Warrior and Warrior Carved that appear in the game AVP: Evolution.
The films Aliens and Aliens v Predator: Requiem have Aliens that are similiar to Number 6 and the Warrior Aliens.