Completionist Hat...
	Easy "Fan-tastic!" Achievement...
	Easy "Party Planner" Achieveme...
	Easy "Sequence Break" Achievem...
	Easy "Slip 'n Slide" Achieveme...
	Easy "Vacuum Vandal" Achieveme...
	Various Steam Achievements...

There is a special, unlockable hat available by collecting all of the time pieces. After doing so, the next time you visit Hat Kid's spaceship, the intruder alert will sound and a present box will appear in the room beside the furnace. The Completionist Hat (a reskin of the Kid's Hat) is inside.

A ceiling fan can be found in the mail room on your ship. You can get there once you have the ice hat (it's up the yellow tube in the central part of the ship). You'll need the grappling hook from the Subcon Well first, of course.

Got it thanks to bl00bird and Talk Show Host that told me that some servers are populated, so you can try to join these servers :

- "1"
- "peck"
- "12345"

On the first act of the first world, get to the time piece without triggering the appearance of Mustache Girl.

In chapter one act two just go down one of the yellow slides (near the sand, go to the left of the spawn and there they are)

Jump on the little robot vacuum cleaner on your ship and let it carry you for a few seconds.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
360 no-feet	Do a 360 flip on the scooter!
A Series of Unfortunate Accidents	Knock off all the sitting Mafia in Mafia Town!
Afraid of Water	Don't fall into the rising water in Subcon Well!
Alpine Skyline - All clear!	Collect all Time Pieces in Alpine Skyline!
Badge Master	Equip 3 badges!
Battle of the Birds - All clear!	Collect all Time Pieces in Battle of the Birds!
Community Contributor	Rate a Steam Workshop level
Encore!	Complete The Big Parade without falling into the audience below!
False Detective	Make it through Murder on the Owl Express without finding any clues (you suck)!
Fan-tastic!	Hook onto a ceiling fan with the hookshot!
Fueling the Feud	Get a total of 2000 points in Battle of the Birds!
If I fit, I sit	Sit in 3 different chairs!
Let there be light	Light up the spaceship!
Mafia Town - All clear!	Collect all Time Pieces in Mafia Town!
No Time To Explain	Complete Train Rush without dying or time bonuses!
One Punch	Defeat any boss with the 1-hit hero badge equipped!
Personally I Prefer the Air	Do 5 homing attacks in a row, without touching the ground!
Pillow Fort	Find Hat Kid's Secret Hideout!
Put a Badge On It	Put on your first badge!
Return Home	Collect all Time Pieces!
Secret Intruder	Make it through Dead Bird Studio without being seen at all!
Sequence Break	No hand-holding for you, apparently!
Slip 'n Slide	Slide down a really long slope!
Subcon Forest - All clear!	Collect all Time Pieces in Subcon Forest!
Take a Hike	Climb to the top of Subcon Forest's big mushroom!
The Community Thanks You	Collect 30 Mod Rift Tokens from Steam Workshop levels
The Floor is Lava	Complete the Lava Cake peak without touching the lava at all!
True Detective	Find all Murder on the Owl Express clues!
Unlimited Possibilities	Play a mod from the Steam Workshop
Vacuum Vandal	Ride the vacuum!
Why	Just... why... ?