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