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