You linked up to get past.

Music was played in harmony.

You set a new record.

You played a videogame with a friend.

Obtain all Relics and Sword Hilts

Unlock a challenge during Fight Week.

Obtain all of the Apples of Iðunn and Horns of Blood Mead

Beat 'Chapter 5 - Urban Warfare' in less than 7 minutes 30 seconds

Have a Doctor enter the cage to check out a cut.

Kill 30 Enemies with the Moss-12

Kill 10 Enemies in a Row with a Single Punch After Weakening Them with Gunfire

Kill 5 Enemies with 1 Explosion

Find 100 Treasures