Here is the full list of all 22 An Airport for Aliens Currently Run by Dogs achievements worth 1,000 gamerscore.
Receive a human heart from a dog in a fedora.
Arrive at Elf Planet airport for the first time.
Arrive at Beachwell airport for the first time.
Arrive at Patsville airport for the first time.
Arrive at Uranus airport for the first time.
Arrive at Phobos airport for the first time.
Arrive at Marinara Trench airport for the first time.
Receive a dark, spherical gift.
Use an ATM.
Join the revolution, through spray paint.
Wake up.
Pet characters 5 times in a single session.
Pet characters 25 times in a single session.
Pet characters 50 times in a single session.
Pet characters 100 times in a single session.
Pet characters 250 times in a single session.
Pet characters 704 times in a single session.
Leave Phobos for the first time.
Meet Chad Shakespeare for the first time.
Meet David Bonie for the first time.
Open your Pupperdex (and handy quest tracker).
Use the "Teleport to Safety" button in the game's menu.