The mask told me to Achievement - Party Hard 2 - Exophase.com

Party Hard 2

Xbox One

7,503 Achievements Earned
579 Players Tracked
37 Total Achievements
26,466 Obtainable EXP
1,000 Gamerscore
6 100% Club

The mask told me to

Complete all hidden objectives

25

1.04% Ultra Rare - 10544.00 EXP

You have not earned this achievement yet