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