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