Five Nights at Freddy's: Security Breach

To get this achievement, you must first have found Vanny's secret room at the top of Fazerblast. You can find it by crawling through a vent in the observatory room right after you win. After that, you must go through the game until it reaches 5:50 and find the exit. You will be given the choice between Stay Leave & Vanny. As soon as you pick Vanny, a cutscene will play and you will get the achievement.