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