Here is the full list of all 29 Second Extinction achievements.
Unlock all perks for one weapon.
Kill 20 Enemies with Supply Drops.
Kill a T-Rex with a Supply Drop.
Complete all core missions.
Take a raptor with you when you extract.
Find the golden egg.
Complete the mission "Contact".
Complete the mission ”Black Site".
Complete the mission "Vestige".
Complete the mission ”Research And Rescue".
Kill 6666 Enemies.
Deploy 50 times.
Respawn 40 times.
Complete the mission "Charged Extraction".
Complete a mission without using a Health Stim.
Complete 40 Contracts.
Deploy 20 times.
Respawn 20 times.
Kill 2000 Enemies.
Complete 20 Contracts.
Complete 10 Contracts.
Deploy 10 times.
Complete a mission without any on the team having to respawn.
Kill 750 Enemies.
Complete the mission "Homebound".
First Deployment.
Respawn 100 times.
Deploy 100 times.
Play 20 missions at night.