This guide provides a list of the locations of all the postcard pieces in Cats in Time, and missable achievements can be aquired as well by follow this guide, let’s check them out.
1 – The Village

Note: clicking on the painting on one of the outside walls (more precisely, on the head of the right figure) will award you the “Ancient Aliens” achievement.
2 – The Shrine

3 – The Port

4 – The Palace

Slide to the right:
5 – The Town

6 – The Windmill

Visible only after you solve the windmill puzzle:
7 – The Basilica

Press the button on the side of the building:
8 – The Lighthouse

9 – The Inn

Visible only after you solve the roof puzzle:
10 – The Watermill

11 – The Castle

Visible only after you solve the tower puzzle:
12 – The Blacksmith

Note: forging the sword will award you the “Blacksmith” achievement.
13 – The City Hall

The third one is actually under the skull, you’ll have to click it first in order to move it.
14 – The Train Station

15 – The Barn

Next to a cat, after solving the puzzle with the valve:
16 – The Mine

17 – The Fire Department

Note: By clicking on the t-shirt hanging on the balcony you will get the achievement “Waldo”.
18 – The Cinema

19 – The Construction Site

20 – The Skyscraper

Inside the vent:
Take the elevator up:
21 – The Tea House

Note: If you press on the 3 pillars in from of the door at the bottom of the building, you will get the achievement “Call the cab”.
22 – The Apartments

Note: if you click on the drone and wait around 5 seconds without doing anything, you will get the achievement “Pilot”.
23 – The Metro

24 – The Factory

25 – The Villa

26 – The Submarine

Click on the stone first to remove it. The postcard piece is underneath it.
27 – The Idol

28 – The Sunken Ship

Secret Level
What to do in order to unlock it is described below under spoiler tags.
Go to the menu and set up the numbers (and pressure dials) like so, then press the yellow button:
Hints for the code can be found in the same room, on the panel with the postcards (some of them have numbers, the others show the correct configuration for the dials).
Inside the level, you will need one extra code to solve one of the puzzles. This is shown on the bottom right postcard: 2332.
That’s all we are sharing today in Cats in Time Locations for All Postcard Pieces & Missable Achievements, if you have anything to add, please feel free to leave a comment below, you can also read the original article here, all the credits goes to the original author 🍒 Lilly (🌸◠‿◠)