|Buy at least one of every upgrade|
This will probably be the last achievement you get. You must purchase every single weapon upgrade. Note that is NOT the Ammo upgrades but the actual various weapon choices. There are 4 different upgrades for each gun and you must complete the campaign in order to unlock them all for purchase. You do NOT have to have all at once, simply have purchased them in the past. (Confirmed via reverting Air Buffer prior to purchasing my final upgrade.)
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