Here is the full list of all 81 Lead and Gold - there are Gangs of the Wild West achievements.
Win 300 Matches.
Revive 720 gangmates.
Perform a Grand Slam (kill 4 players within a short amount of time) in any multiplayer match.
Kill 180 enemies with your sidearm (Gunslinger's revolver not included).
Tag 800 enemies.
Conquer 720 zones.
As the Gunslinger, deliver 3 sacks of gold and kill 12 enemies in a multiplayer round.
Kill 900 enemies using fanning.
Kill 2000 enemies.
Destroy 60 objectives.
Destroy 60 Objectives.
Conquer 180 zones.
Kill 3 enemies with a six shooter without reloading in a multiplayer match.
Win 100 matches.
Kill 300 enemies using fanning.
Play a multiplayer round without getting killed or knocked down and kill at least 8 enemies.
Attain rank 9 in a multiplayer match.
Kill 60 enemies with your sidearm (Gunslinger's revolver not included).
Kill 180 enemies with dynamite.
Kill 20 enemies with fanning in a multiplayer round.
Kill 1000 enemies.
Win 30 conquest matches.
Revive 12 gangmates in a multiplayer round.
Revive 180 gangmates.
Kill 3 enemies with a single dynamite blast.
During a multiplayer round, gangmates kill 10 enemies tagged by you.
Kill one and only one of each archetype in a row (without dying)
Win 30 matches involving sacks of gold.
Perform 10 headshots with the Buffalo rifle in a single multiplayer round.
Deliver 180 sacks of gold.
Collect 8 sacks of gold in a Goldfever (COOP) match.
Kill 7 enemies with headshots in a row (without dying)
Destroy 20 Objectives.
Shoot off 250 hats.
Shoot off 4 enemy hats in a row (without dying or killing them)
Tag 250 enemies.
Perform at least 8 head shots in a single multiplayer round.
Kill 20 enemies with your sidearm (Gunslinger's revolver not included).
Tag 20 enemies during a multiplayer round.
Shoot off 100 hats.
Play a multiplayer round without getting killed or knocked down and kill at least 4 enemies.
Kill 3 enemies caught in your traps during a multiplayer round.
Kill 15 enemies with dynamite in a multiplayer round.
Killl 30 enemies with dynamite.
Tag 40 enemies.
Kill 6 enemies caught in traps in a single multiplayer round.
Trap 30 enemies.
Deliver 4 sacks of gold in a single multiplayer round.
Deliver 30 sacks of gold.
Kill 3 enemies within 12 seconds using fanning.
Play all release maps.
Rack up 30 kills in a multiplayer round.
Kill 25 enemies with the coach gun in a multiplayer round.
Shoot off 15 hats in a multiplayer round.
Rack up 20 kills in a multiplayer round.
Finish off 20 knocked down (KD) enemies in a single multiplayer round.
Conquer 30 zones.
During a multiplayer round, teammates kill 5 enemies tagged by you.
Kill 50 enemies using fanning.
Revive 5 gangmates during a single game round.
Revive 30 gangmates.
Die 300 times.
Score a long range headshot.
Kill 250 enemies.
Be the player delivering the most sacks to base during a round. Repeat 3 times.
Die 150 times.
Finish off 10 knocked down (KD) enemies in a single multiplayer round.
Shoot off 20 hats.
Win a match.
Revive a gangmate.
Kill an enemy.
Catch 10 enemies in your traps during a single multiplayer round.
Win 100 matches involving sacks of gold.
Win 100 powder keg matches.
Win 100 conquest matches.
Destroy 180 Objectives.
Deliver 720 sacks of gold.
Kill 720 enemies with dynamite.
Trap 180 enemies.
Trap 720 enemies.
Kill a developer.