Here is the full list of all 27 OXENFREE II: Lost Signals achievements.
Become friendly with Charlie.
"...the apex of my accomplishment."
Prevent Olivia from tuning the portal and smash her radio.
Become friendly with Violet.
Become friendly with Olivia.
"...accept what you find."
Don't pet Athena.
"Finally...Planetshine."
Pet Athena.
Deliver the shoe to Hank.
Discover all Adler letters.
Check in with Evelyn for all three transmitters.
Place the transmitter at Garland.
Talk to a young radio enthusiast.
Discover the complete Adler Letters Set 2.
Prevent Olivia from tuning the portal in any way.
Save Shelley.
Agree to be a special kind of friends.
Discover the complete Adler Letters Set 4.
Finish Nick’s journey.
Place the transmitter at Tootega Falls.
Discover the complete Adler Letters Set 1.
Discover the complete Adler Letters Set 3.
Hear Maria tell Charlie she has a crush on him.
Place the transmitter at Charity Point.
Create the scariest One Word Story.
Find out the secret at Jacob's House.