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