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