You can make an achievement your active mission by clicking on it. In that case, the required weapon and perk will be offered to you at early levels, so you can go ahead and try to get the achievement you desire. However, you can play only 10 minutes with an active mission, just enough time to complete it. If you want to play a 10+ minutes game, you should do it in a pure way, without pre-set weapons and perks offered to you.
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