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.
Explore 7 ruins.
Plant 1000 seeds.
Remove 150 Noxious Slimes.
Increase Homestead Coziness to 3.
Feed 50 animals.
Get 10 upgrades at the Upgrade Depot.
Remove 50 Noxious Slimes.
Build the radio tower.
Plant 500 seeds.
Increase Homestead Coziness to 2.
Remove 300 Noxious Weeds.
Remove 100 Noxious Weeds.
Spray water at another player.
Feed 20 animals.
Explore a ruin.
Plant 100 seeds.
Get an upgrade at the Upgrade Depot.
Increase Homestead Coziness to 1.
Restore a region.
Plant your first seed.
Feed an animal for the first time.
Remove 10 Noxious Slimes.
Scare away 10 animals.