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