Return to the doctor with the cave mushrooms.

Lure and kill a predator.

Complete a WANTED Dead quest.

Defeated Terramorphous the Invincible

Killed a flying enemy with a thrown Tediore weapon

Tipped Moxxi $10,000

Completed the mission "Data Mining"

Completed the mission "Toil And Trouble"

Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve

Discovered all named locations in Sanctuary, Opportunity, and Lynchwood

Completed the mission "The Once and Future Slab"

Completed the mission "Long Way To The Top"