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