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.
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.
Complete a match in all multiplayer modes.
Catch a player in a snare trap in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.
Complete all challenges.
Find all documents, relics and GPS caches.
Complete all conversations with the Endurance crew.
Shoot 10 enemies off zip lines.
Fully mod and completely upgrade all weapons.
Complete all optional tombs.
Purchase all skills in all categories.
Find 75% of GPS caches.
Incapacitate 25 enemies with dodge counter.
Complete the game.
Kill 40 enemies with the shotgun.
Fully mod and completely upgrade any weapon.
Find 75% of all documents.
Collect 75% of all relics.
Loot 200 enemies.
Kill FeeFee the crab.
Kill 75 enemies with the rifle.
Kill 25 unaware enemies.
Purchase all skills in one category.
Survive 10 explosions in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Collect 5000 pieces of salvage.
Perform 50 headshot kills in the single player campaign.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Find 25% of GPS caches.
Kill 35 enemies with the pistol.
Rope pull 5 enemies off edges.
Perform 15 finishers.
Kill and loot 10 small animals (rabbits, chickens, rats).
Collect 25% of all relics.
Kill 50 enemies with the bow.
Find 25% of all documents.
Complete one optional tomb.
Kill and loot 10 flying animals (crows and gulls).
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Win a ranked match in every multiplayer mode.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.