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