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