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