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