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