Here is the full list of all 29 Second Extinction achievements.
Deploy 100 times.
Respawn 100 times.
Kill 6666 Enemies.
Respawn 40 times.
Play 20 missions at night.
Deploy 50 times.
Respawn 20 times.
Unlock all perks for one weapon.
Kill a T-Rex with a Supply Drop.
Find the golden egg.
Kill 2000 Enemies.
Deploy 20 times.
Complete 40 Contracts.
Kill 20 Enemies with Supply Drops.
Complete a mission without using a Health Stim.
Complete the mission "Contact".
Complete all core missions.
Deploy 10 times.
Kill 750 Enemies.
Complete 20 Contracts.
Complete the mission ”Black Site".
Complete the mission "Vestige".
Complete the mission ”Research And Rescue".
Complete 10 Contracts.
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.