Empyrean achievements

Unify the Combines and the revolutionaries.

Shoot down at least five enemy aeros.

Only crash once.

Reach 75 Empyrean at any time.

End the game with Revolutionary Character 80 or higher.

End the game with Combine Character 80 or higher.

Fight a sword duel on the wing of an aero.

End the game with Actorius Grandeur 80 or higher.

Reprogram an automaton.

Fly the Gossamer.

Find the Iridium Garden.

Romance the Air Guard captain.