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