Here is the full list of all 48 Tom Clancy's Rainbow Six Siege achievements worth 1,000 gamerscore.
Eliminate 5 opponents with pistols.
Complete 10 matches in Quick Match/Ranked Multiplayer.
Get 50 headshots in Quick Match/Ranked Multiplayer.
Equip 50 weapon attachments.
Win a match of Secure Area in Quick Match Multiplayer.
Eliminate 10 opponents through bullet penetration in Quick Match/Ranked Multiplayer
Get 5 Flawless Victories in Ranked.
Apply weapon skins to 30 weapons.
Eliminate 5 opponents with SMGs.
Play 10 rounds with each Pathfinder Operator in Quick Match/Ranked Multiplayer.
Eliminate 100 opponents in Quick Match/Ranked Multiplayer.
Destroy 10 cameras as an Attacker.
Win 50 rounds in Quick Match/Ranked Multiplayer.
Eliminate 5 opponents with ARs.
Eliminate 5 opponents with shotguns.
Eliminate 5 opponents with DMRs.
Achieve Gold Rank.
Customize a weapon.
Find a bomb within 15 seconds of the 'Bomb' Preparation Phase in Quick Match/Ranked Multiplayer.
Breach and rappel through a window in Quick Match/Ranked Multiplayer.
Eliminate an Attacker caught in Barbed Wire in Quick Match/Ranked Multiplayer.
Play 10 rounds with all Operators from one Pathfinder ORG in Quick Match/Ranked Multiplayer.
Destroy a floor with a Breach Charge in Quick Match/Ranked Multiplayer.
Reinforce 2 breakable walls in Quick Match/Ranked Multiplayer.
Destroy 20 gadgets in Quick Match/Ranked Multiplayer.
Disable the defuser in 5 Bomb matches in Quick Match/Ranked Multiplayer.
Plant the defuser in 10 Bomb rounds in Quick Match/Ranked Multiplayer.
Collect and save 5000 Renown.
Win 10 games as a Squad in Quick Match/Ranked Multiplayer.
Destroy 5 drones in Quick Match/Ranked Multiplayer.
Play 10 rounds with a Pathfinder Defender in Quick Match/Ranked Multiplayer.
Play 10 rounds with a Pathfinder Attacker in Quick Match/Ranked Multiplayer.
Win a round in Quick Match/Ranked Multiplayer in under 2 minutes.
Eliminate 10 opponents with Frag Grenades in Quick Match/Ranked Multiplayer.
Win 100 rounds as an Attacker in Quick Match/Ranked Multiplayer.
Place 5 barricades as a Defender in Quick Match/Ranked Multiplayer.
Win 100 rounds as a Defender in Quick Match/Ranked Multiplayer.
Eliminate 10 opponents with Claymores in Quick Match/Ranked Multiplayer.
Win 1 round with every Pathfinder Operator in Ranked.
Reach Clearance level 50.
Win 10 matches of Bomb in Quick Match/Ranked Multiplayer.
Eliminate 10 opponents blinded by Stun Grenades in Quick Match/Ranked Multiplayer.
Eliminate an opponent with a Breach Charge in Quick Match/Ranked Multiplayer.
Destroy a reinforced wall with the Thermite Charge in Quick Match/Ranked Multiplayer.
Eliminate 10 opponents with Nitro Cells in Quick Match/Ranked Multiplayer.
Receive a Skill Rank in Ranked Multiplayer.
Win 1 match without losing a single round in Ranked Multiplayer.
Revive injured teammates 10 times in Quick Match/Ranked Multiplayer or Training Grounds.