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