Start the game and fly all the way up to the top where the game ends. Full description in the spoiler tag below.
When the game goes back to the main menu you will see credits at the bottom. Click the credits and the achievement will unlock.
EDIT: Added from comments. If the game crashes at this point, restart the game, and the credits link will still be showing. Click it and you'll still get the achievement.
EDIT 2: From the comments.
Mortis_Invictus said:Might want to update your guide to mention that the Mac version of this achievement appears to be unobtainable - it looks like this only works on Linux or a PC.
Takes around 5 minutes.