Here is the full list of all 117 Falling words achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
9
8
7
6
5
4
3
2
1
0
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Z
Y
X
W
V
U
T
S
R
Q
P
O
N
M
L
K
J
I
H
G
F
E
D
C
B
A