Here is the full list of all 13 Swelter achievements.
Freedom is life not according to someone else's rules. Bet on independence.
Open all caches marked with a radio beacon.
He will not tell wisdom, but he will help find wisdom. Find a yurt with a vortigaunt.
Find the AK left many years ago.
Complete the bonus part.
Tea.
Get killed by a train run at the very beginning.
Rob the Combine armory.
It is easy to break one straw, but it is more difficult to break a bunch. Bet on unity.
Show your superiority in the air.
The attacking helicopter looks best on the ground. Bring it down.
Eliminate the missile turret.
Survive a failed train disembarkation.