Trophy Description:Used all 8 Vigors against enemies.
Bronze Trophy.

Vigors are magical abilities extremely similar to the Plasmids from the original BioShock. Once you obtain them, they can be selected by holding L2 and choosing your desired Vigor with LS. You can then use a Vigor by pressing L1, provided you have enough Salts to use it. You do not have to kill an enemy with each Vigor, just use it once on them. Only two Vigors will be acquired automatically during the story, but the other 6 are extremely easy to find. If you do happen to miss one however, they will become available to buy from the Veni Vidi Vigor vending machines slightly later on. Listed below are the earlier times you encounter each Vigor:

Vigor Locations:

#1 Possession - Welcome Center
The first Vigor will be given to you by a lady at the funfair. You need it to continue, so it cannot be missed.

#2 Devil's Kiss - Raffle Square
This will be dropped by the first Fireman you defeat.

#3 Murder of Crows - Comstock Center Rooftops
This will be dropped by the first Crow you defeat.

#4 Bucking Bronco - Hall of Heroes
When the first wave of enemies attacks you in the room with the big statue in the centre, a door to a side-room will open. In this side-room (where the enemies came from) is the Bucking Bronco Vigor on a table.

#5 Shock Jockey - Hall of Heroes Gift Shop
This Vigor will be obtained automatically as it is required to continue the story.

#6 Charge - Finkton Proper
After exiting the elevator go straight into the office room. The Charge Vigor is in this room. This is only available on your way back through this area, as the first time it is barred by a gate.

#7 Undertow - The Factory
After exiting an elevator you will be in a room with three enemies that look at some corpses and at the end of the room is a big neon sign saying "Fink MFG". The Undertow Vigor is under the neon sign.

#8 Return to Sender - Downtown Emporia
This Vigor is an exception, as the first opportunity you get to find it is highly missable. To begin with, just before you go through the turnstiles (the ones you cant return through) in Emporia, there will be the Founder Book Store to the left. In a room at the back is a Voxophone which tells you to go to the Salty Oyster Bar and press a button underneath the cash register on the bar. Backtrack to the Bar and find the button. Once you press it, a hidden door will open, behind which is Return To Sender.

The far more obvious location is in Downtown Emporia. After using an elevator you will go outside and lots of enemies will attack you. After fighting them off, follow the marker to the next objective. Elizabeth will have to lockpick a gate. After a short scene where Elizabeth talks to you, she will open the gate. After she opens the gate you will see the Return To Sender Vigor hanging out of a box in the corridor in front of you.
Video of all locations is below.