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