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