Goodbye, Dear Friend is a main story mission in Red Dead Redemption 2 given by Sadie Adler, as part of Chapter 6.
It's the 83° mission in chronological order of the RDR2 story mode, played with protagonist Arthur Morgan.
Goodbye, Dear Friend - Mission Details:
With Colm O'Driscoll under arrest, Sadie, Arthur and Dutch head to Saint Denis to watch him hang.
Mission Objectives
Gold Medal Objectives (100%)
The following are the Mission Objectives required to obtain the Gold Medal in the mission "Goodbye, Dear Friend":
- Find Colm’s back up within 45 seconds
- Get 8 headshots with a long scoped rifle
- Complete within 6 minutes 30 seconds
Note: You must complete all Gold Medal requirements in one single playthrough of the mission.
Goodbye, Dear Friend: Mission Info
- Mission Number 83
- Story Chapter Chapter 6
- Mission Type Mandatory Mission
- Mission Giver
Sadie Adler - Protagonist (Playable)
Arthur Morgan - Location Saint Denis (Bayou Nwa, Lemoyne)
- Rewards Unlocks the "Third Time Lucky" Trophy / Achievement.
- Unlocked Items
Carcano Rifle 
Litchfield Repeater - Featuring
Carcano Rifle Litchfield Repeater
Colm O'Driscoll 
Dutch van der Linde 
O'Driscoll Boys Gang