Here is the full list of all 26 Lightyear Frontier achievements.
Explore the vault in Outset Grasslands.
Restore all regions in Outset Grasslands.
Remove 700 Noxious Weeds.
Remove 150 Noxious Slimes.
Increase Homestead Coziness to 3.
Plant 1000 seeds.
Plant 500 seeds.
Get 10 upgrades at the Upgrade Depot.
Build the radio tower.
Remove 300 Noxious Weeds.
Remove 50 Noxious Slimes.
Increase Homestead Coziness to 2.
Plant 100 seeds.
Increase Homestead Coziness to 1.
Explore a ruin.
Feed 20 animals.
Remove 100 Noxious Weeds.
Get an upgrade at the Upgrade Depot.
Feed an animal for the first time.
Plant your first seed.
Scare away 10 animals.
Restore a region.
Remove 10 Noxious Slimes.
Explore 7 ruins.
Feed 50 animals.
Spray water at another player.