Here is the full list of all 18 Grapples Galore achievements.
You got 100 kills total.
You won 10 games.
Get a kill with every weapon in one game
You killed 2 or more players with 1 RPG.
You got 3 kills with only 1 shotgun.
Kill someone 200+ meters away with a crossbow
Claim a bounty
You got 10 kills total.
Get a bounty
You won 1 game.
You got your first kill.
Grapple onto another player
Win an FFA game with only assists
You won 100 games.
Kill 10 players without dying
Hit multiple players with one burst
Hit every shot with a minigun
Explode a teammate with a barrel in TDM