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