Here is the full list of all 50 Tomb Raider achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Kill 2 multiplayer enemies with a single explosive.
Revive a teammate in a multiplayer match.
In multiplayer, be the only player on your team that isn't dead or downed.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
In multiplayer, escape death 3 times by using the rope ascender.
Kill a zip-lining enemy player in multiplayer.
Catch a player in a snare trap in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Survive 10 explosions in multiplayer.
Incapacitate 25 enemies with dodge counter.
Complete all challenges.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Kill 40 enemies with the shotgun.
Rope pull 5 enemies off edges.
Complete all optional tombs.
Purchase all skills in all categories.
Complete the game.
Fully mod and completely upgrade any weapon.
Complete all conversations with the Endurance crew.
Find 75% of all documents.
Collect 75% of all relics.
Kill 75 enemies with the rifle.
Find 75% of GPS caches.
Kill and loot 10 flying animals (crows and gulls).
Kill FeeFee the crab.
Shoot 10 enemies off zip lines.
Kill 35 enemies with the pistol.
Purchase all skills in one category.
Loot 200 enemies.
Kill 25 unaware enemies.
Collect 5000 pieces of salvage.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Kill 50 enemies with the bow.
Find 25% of GPS caches.
Collect 25% of all relics.
Find 25% of all documents.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).