Flying Solo not unlocking/glitched

[Syrette]

Seems to be the case that most people are getting this achievement fine. However for me it's simply not unlocking, despite me following the simple requirement for it.

What I've been doing is this:

- Started game

- Switched to Amedeaus (wizard)

- Selected the 2nd level from the pause menu's level select screen

- Gone to Restart from Last Checkpoint if I die

Am I missing something?

Not once do I change character and it's not unlocked in 3-4 attempts. A guy with a similar issue to me on the x360a achievement page for it has the same issue and reckons the best way to get it is to go through a level without restarting from a checkpoint,

It's not the end of the world and if I never get, then I'll never get it but it is still annoying to do the work and not get the achievement for it.