This is the first thing you do at the start of the game.
The training exercises are very easy to do because it will give you button notification on the screen to how to do it.
The training modules you need to fulfil are:
Camera controls
Basic controls
Movement
Weapons and tactics
Close quarters
AR mode
Once you've finished the AR mode training the achievement will pop.
The training will also only take you about 5 minutes to do.