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Hello :-)

In the main menu go to options, there you will find a complete list of all your achievements and their respective reward. For example, if you played the first time as a soldier and got all the weapons achievements and later you decide to replay as an engineer, adept or sentinel, you can equip them with an assault rifle, a shotgun or a sniper rifle, thus adding to their firepower wich is limited only to a pistol. I hope your question has been properly answered.