Weapon Specialist Achievement
Fully upgrade a weapon
Once you have recruited Mordin, you can complete Research Projects at the station in the Tech Lab. Go to the weapons and it will show you what upgrades you can make. You will find these upgrades during missions, which will then be available to create.
Along with finding upgrades throughout missions, you can purchase upgrades on Omega, The Citadel, Illium and Tuchanka. The in-game achievement tracker as well as the ‘check upgrades’ station next to the research station will let you know how many you have left on a specific weapon after upgrading it. Each weapon has 5 damage upgrades and various miscellaneous ones. In order to research certain upgrades, you will need to have a certain amount of damage upgrades completed.
Note: Purchased upgrades will directly count; you don’t need to research them, unlike the ones you pick up.
Purchasable Weapon Upgrades:
Kenn’s Salvage - Omega - Shotgun damage upgrade
Omega Market - Omega - Sniper rifle damage upgrade
Rodam Expeditions - The Citadel - Heavy pistol damage upgrade, Sniper rifle damage upgrade, Submachine gun upgrade
Gateway Personal Defense - Illium - Assault rifle damage upgrade, Submachine gun damage upgrade
Fortack’s Database - Tuchanka - Assault rifle damage upgrade, Heavy pistol damage upgrade, Shotgun damage upgrade