Here is the full list of all 39 Outcast - there are Second Contact achievements worth 1,000 gamerscore.
Kill 25 Krakits.
Obtain the Mon in Okaar.
Defeat 250 soldiers.
Complete the organ puzzle in Okaar.
Kill the Achondar.
Kill all the gamors in the Okaar arena.
Reach the region of Okaar.
Set Shamaz Keb free.
Help Zern fix the boat light by providing a piece of helidium from Motazzar.
Obtain the Mon in Okasankaar.
Destroy the company of soldiers located in Zorkatraz.
Unlock the wheel to enter the Darosham!
Defeat 150 soldiers.
Defeat at least 20 soldiers in Motazaar for Ashkar.
Damage the rift bridge to slow the soldiers down.
Reach the region of Motazaar.
Defeat 10 soldiers using dynamite.
Travel 10 times through Daokas.
Talk to 25 important Talans.
Help Sadar fix his boat using a Zeedog plant.
Achieve the highest level of reputation by helping the Talans.
Defeat more soldiers to convince Zot to stop paying taxes.
Reach the region of Okasankaar.
Destroy the boats in Shamazaar to weaken the soldiers!
Help Heza repair his well.
Reach the region of Talanzaar.
Find the Mon in Shamazaar.
Kill the gamors far to the east of the village.
Deliver a Twon-ha for Zolass.
Use dynamite on a chest.
Kill the beast in the water behind the temple of Ka.
A worker at one of the temples wants the Yods to clear away the debris.
Find a Shamaz and convince him to heal Ilott.
Defeat at least 20 soldiers for Maar.
Fill your backpack with over 250 rounds for your UZA-SH1.
Find Shamaz Zeb and speak to him.
Complete all four tests with Jan.
Obtain over 300 rounds for your HK-P12.
Complete the stealth tutorial in Ranzaar with Jan.