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