Rocksmith 2014 Edition

This achievement will be awarded for playing with 50 instruments in session mode.

Now this is a little misleading as you don't have to play 50 actual instruments. What it means is 50 different backing instruments during session mode.

Load up session mode from the main menu and at the session mode menu select "Load Preset band".
Now start at the basic section and select "Barebones Rock"

Now press X to start session and strum anything until you see all instrument pictures start pulsing (this mean they are playing).

Now press X to end that session and again load the next preset bands and continue to do this and work your way through all bands until the cheevo pops.

The other way you can do this is to change each instrument individually and make a note of which ones you have used.

Once you have played with 50 different instruments the cheevo will pop.

Personally I recommend loading individual instruments as you can fill all 4 slots every time where as some preset bands only use 2 instruments and sometimes you may end up using instruments you have previously played with.

Happy playing.