Mass Effect 2: Upgrade Locations

Sub Machine Guns

In the assault on Archangel.

During Thane's recruitment mission, just before the windy bridge.

Sold at Rodam Expeditions on the Citadel.

Heavy Pistol

On Tali's recruitment mission. Sold at Rodam Expeditions on the Citadel.

Assault Rifle Damage

In the quarantine area on Omega, just after a barricade of mercs.

On Tali's recruitment mission. On Ilium at Gatway Personal Defense

Shotgun Damage

On the prison world while saving Jack.

Sniper Rifle Damage

On the level you find Grunt At Omega Market.

Sold at Rodam Expeditions on the Citadel.

Biotic Damage

On Horizon world.

During Samara's recruitment mission

Tech Damage

In the assault on Archangel.

Sold at Saronis Applications on the Citadel.

Heavy Skin Weave

On Horizon world.

On Ilium at Gatway Personal Defense

Medi-Gel Capacity

Complete Dr Chakwas' side mission (brandy). Sold at Cirta Foundations on the Citadel.

During Mordin's recruitment

Heavy Weapon Ammo

On the first level with the quarian, on the dead mech before saving Veetor.

Korgan Vitality

On the level you find Grunt

Damage Protection

On the prison world while saving Jack.

Ablative VI Shield Upgrade - Sold at Saronis Applications on the Citadel.