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