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