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