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