Complete all training missions.

In order to complete this achievement you must complete all training missions.

1. To get this achievement you have to have unlocked Cafe Theatre, once you have done that go to the training room on the 2nd highest floor.
2. Go to the guy sitting in the corner and press B to launch training, complete all the ones you can.
3. Some you won't be able to get as you haven't unlocked them, to unlock them you must go to Character Customization on the pause menu and unlock the skills you are missing.
4. Then go and complete the last few trainings.

Once you have completed the last training you will get the achievement.

If you unlock the skills before attempting this everything will be alot faster and easier.
Make sure you have time set aside as it does take a while to complete them all.

If you need any help feel free to PM me.