Here is the full list of all 29 Second Extinction achievements.
Kill 6666 Enemies.
Deploy 100 times.
Respawn 100 times.
Play 20 missions at night.
Deploy 50 times.
Respawn 40 times.
Complete 40 Contracts.
Kill a T-Rex with a Supply Drop.
Respawn 20 times.
Deploy 20 times.
Kill 20 Enemies with Supply Drops.
Find the golden egg.
Unlock all perks for one weapon.
Complete 20 Contracts.
Deploy 10 times.
Kill 2000 Enemies.
Complete 10 Contracts.
Complete the mission "Contact".
Complete all core missions.
Complete the mission ”Black Site".
Complete the mission "Vestige".
Complete the mission ”Research And Rescue".
Kill 750 Enemies.
Complete the mission "Charged Extraction".
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.
Complete the mission "Homebound".
First Deployment.