Collect all trophies
Ride the sewer contraption with Henry and Sam
While in stealth, turn off the spotlight generator in Pittsburgh.
Leave Ellie hanging after a job well done
Complete Left Behind
Use bricks or bottles to lure an infected into attacking a human
Find all notes and artifacts
Win the water gun fight
Defeat Black Fang without getting hit
Played the Jak X game in Left Behind
Engage in all optional conversations
Survive all of Ellie's jokes
Win the brick throwing contest
Find all Firefly pendants
Complete Part 1
Collect all comics
Break into every locked door using shivs
Find all workbenches
Find all training manuals
Find all workbench tools
Pet Buckley the dog
Open All Safes
Fully upgrade a weapon
Upgrade and then break one of every melee weapon
Craft every item
Find a comic
Pick up Frank's note after it's discarded
Find one training manual
Find a Firefly pendant