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