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