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