Here is the full list of all 19 Sunday Gold achievements.
Meet Sally and Gavin
Pay Frank's bar tab
Discover the location of Hogan Industries' research facility
Escape from Hogan Industries headquarters
Discover evidence of Kenny Hogan's machinations
Escape from the research facility
Confront Kenny Hogan
Destroy Kenny Hogan
Give the money back to the victim
Contact Gary Marshall and convince him to go to the Pub
Find Kenny Hogan's secret stash
Talk the guard into leaving his job and going to the Pub
Rescue the homeless man from the clandestine lab
Discover the hidden security audio logs in Hogan manor
Find Kenny's family heirlooms
Kill 50 enemies
Kill 100 enemies
Acquire every weapon in the game
Acquire every gear item in the game