Kill 5 Helghast in 15 seconds whilst on foot and maintaining at least 85% health

Complete Visari Square on any difficulty level

Kill the Blood Meridian heavy in under 1 minute

Post a comment on a community level

Discovered 100 locations

Completed "Take it Back!"

Talk to Elika.

Complete a Mission intercepted from a cellular tower signal

You successfully killed 20 players with a pistol in a deathmatch.

You were invited into your girlfriend's house.

You have completed the story.

Beat the qualifier time on any Time Trial stretch

Kill five enemies with a single punch, after softening them up with gunfire