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