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