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.
Kill 2 multiplayer enemies with a single explosive.
Complete a match in all multiplayer modes.
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.
Find all documents, relics and GPS caches.
Complete all challenges.
Fully mod and completely upgrade all weapons.
Find 75% of GPS caches.
Purchase all skills in all categories.
Complete all optional tombs.
Collect 75% of all relics.
Find 75% of all documents.
Complete one challenge.
Complete the game.
Fully mod and completely upgrade any weapon.
Purchase all skills in one category.
Complete all conversations with the Endurance crew.
Perform 15 finishers.
Kill FeeFee the crab.
Loot 200 enemies.
Find 25% of GPS caches.
Kill 40 enemies with the shotgun.
Kill and loot 10 flying animals (crows and gulls).
Collect 5000 pieces of salvage.
Kill 75 enemies with the rifle.
Kill 25 unaware enemies.
Collect 25% of all relics.
Shoot 10 enemies off zip lines.
Incapacitate 25 enemies with dodge counter.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Rope pull 5 enemies off edges.
Kill 35 enemies with the pistol.
Perform 50 headshot kills in the single player campaign.
Find 25% of all documents.
Kill 50 enemies with the bow.
Complete one optional tomb.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill and loot 10 large animals (deer, boar, wolves).
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.
Catch a player in a snare trap in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Survive 10 explosions in multiplayer.