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