Here is the full list of all 30 Sheepy: A Short Adventure achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
You beat the game in 30 minutes.
You finished the game without dying.
You beat the game in 45 minutes.
The last one?
Wait, another Sheepy?
You lit all the crystals!
You listened to all the tapes.
The third one!
You have activated the 6 levers.
It feels nostalgic here.
The second one!
You finished the game.
... is awaiting you.
I know this place!
But now you can fly.
You showed Patches who's the boss.
You can do it!
Run as fast as you can.
Almost done!
GOTTA GO FAST
Archaeologist is a dangerous job.
BABY, RIGHT 'ROUND
Such an engineer.
"Your estimated wait time is forever."
You made a new friend!
"Taking You Higher"
Something happened here...
The first one!
...but no you can't, because you're a sheep.
You're a smart one, aren't you ?