Acquire all upgrades for all weapons

Purchase both upgrades for all of the guns in the game, the pistol, the shotgun, the machine gun, the chemical thrower, the grenade launcher, or the crossbow. There are 12 stations in all, and here are the locations of the Power to the People stations (thanks to Little_Moth at Gamefaqs for this):

1. Neptune's Bounty - Freezer Bottom Floor, on the wall in front of you as you come down to this area.

2. Arcadia - Tree Farm, enter this area from the Southern (check the Map) entrance, turn right and go up the stairs. Then look left and it will be in a little alcove.

3. Farmer's Market - Winery Cellar Bottom Floor, go down the stairs from Winery Cellar Top Floor, head straight and you will enter a small area waist deep with water. The machine is on the wall in the centre.

4. Fort Frolic - Southern Mall, Le Marquis D'Epoque, this store is the last one in the Southern Mall area. Go downstairs and turn left twice to enter an alcove with loads of cigars and the Power to the People machine.

5. Fort Frolic - Poseidon Plaza, Sinclair Spirits, go behind the counter and find a button, push it. Go into the newly opened door and go downstairs to find the Power to the People machine.

6. Hephaestus - Core, as you enter this area from the tunnel turn left, go down the stairs and keep walking forward until you reach a Gatherer's Garden machine on the left wall and a Power to the People machine opposite it on the right wall..

7. Hephaestus - Lower Workshops, Kyburz's Office, the Power to the People machine is at the back of the room and to the left.

8. Olympus Heights - Mercury Suites, once you enter this area there is a huge pillar with a lift in it in the centre of this area. The Power to the People machine is on the opposite side of the pillar to where the lift door is.

9. Olympus Heights - Mercury Suites, Cohen's Apartment, once you enter this apartment you will see 2 Houdini Splicers dancing, kill them. Sander Cohen will come down from his room, kill him too. Then go up the stairs into the room he was in (on the right as you enter his apartment) and look to the left to see the Power to the People machine on the wall.

10. Apollo Square - Hestia Fourth Floor, first go to the fifth floor and turn right to enter a door, go to the back of this room and turn right to see some stairs, go down them and a little to the right you will see the Power to the People machine.

11. Point Prometheus - Atrium, right as you enter this area look straight ahead and you will see a Vita-Chamber at the back of the room. A little to the left is the Power to the People machine on the wall by the corpse of a Big Daddy.

12. Point Prometheus - Optimized Eugenics, Eugenic Analysis, enter this area and turn left, go to the back of this room and you will find the Power to the People machine on the wall to the left.