Click the game.
Click 'Arcade'.
Click 'Watch'
Pause the recording when there's 1:27 left.
Press
.
Click Start Playing.
As soon as you start playing, press
.
Select 'Quit Game'.
Select 'Quit (Save)'.
Click 'Arcade'.
Click 'Continue'.
Hit the boss once or twice to by jumping with
and pressing
to kill the two bosses.
This achievement will then pop in the credits.