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