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 finished the game without dying.
You beat the game in 45 minutes.
You beat the game in 30 minutes.
Wait, another Sheepy?
You finished the game.
... is awaiting you.
The last one?
You listened to all the tapes.
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.
You lit all the crystals!
You have activated the 6 levers.
The third one!
It feels nostalgic here.
BABY, RIGHT 'ROUND
Such an engineer.
The second one!
"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 ?