Left click tiles to swap them.
Right click to move the camera.

Once complete, press Walk, then change the speed to 8x.
Make sure to complete rivers in certain levels for their respective achievements.

"...These are the 13 levels with rivers: 3, 8, 9, 18, 19, 21, 22, 23, 30, 31, 33, 34, 35.
They unlock the 13 river achievements in order.

Also, the River 10 achievement (level 31) was a bit buggy for me.
If it doesn't unlock properly even after placing the two pieces in the correct location,
try picking up the straight piece again. That seemed to unlock the achievement." -alphabetsoup

Level 0

Level 1

Level 2

Level 3

Level 4

Level 5

Level 6

Level 7

Level 8

Level 9

Level 10

Level 11

Level 12

Level 13

Level 14

Level 15

Level 16

Level 17

Level 18

Level 19

Level 20

Level 21

Level 22

Level 23

Level 24

Level 25

Level 26

Level 27

Level 28

Level 29

Level 30

Level 31

Level 32

Level 33

Level 34

Level 35

Level 36

Level 37

Level 38

Level 39

Level 40

Level 41

Level 42

Level 43

Level 44

Level 45

Level 46

Level 47

Level 48

Level 49

Level 50

Level 51

Thanks for viewing this guide!
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For my other guides, they are here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2880052179