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