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