The following is a list of all the items which become available when you reach a certain level. Once you reach level 13 and can obtain the Legendary assault rifle ("Warrior Assault Rifle") you will be able to obtain all in-game items (if luck is in your favour).
Niveau 2
Niveau 3
Niveau 4
Niveau 5
Niveau 6
Niveau 7
Niveau 8
Niveau 9
Niveau 10
Niveau 11
Niveau 12
Niveau 13