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