1.0·Every feature free until Premium arrives in October
100 hidden aliens achievements, rarest first.
Every achievement in 100 hidden aliens, ranked by how many Steam players have unlocked it. Global completion rates from Steam, refreshed daily.
The rarest achievement
Alien
89%
of players
- Achievements
- 100
- Rarest
- 89%
- Ultra rare (under 5%)
- 0
- Average completion
- 94%
1
Alien
ok
89%
2
Alien
ok
91%
3
Alien
ok
92%
4
Alien
ok
93%
5
Alien
ok
94%
6
Alien
ok
94%
7
Alien
ok
94%
8
Alien
ok
94%
9
Alien
ok
94%
10
Alien
ok
94%
11
Alien
ok
94%
12
Alien
ok
94%
13
Alien
ok
94%
14
Alien
ok
94%
15
Alien
ok
94%
16
Alien
ok
94%
17
Alien
ok
94%
18
Alien
ok
94%
19
Alien
ok
94%
20
Alien
ok
94%
21
Alien
ok
94%
22
Alien
ok
94%
23
Alien
ok
94%
24
Alien
ok
94%
25
Alien
ok
94%
26
Alien
ok
94%
27
Alien
ok
94%
28
Alien
ok
94%
29
Alien
ok
94%
30
Alien
ok
94%
31
Alien
ok
94%
32
Alien
ok
94%
33
Alien
ok
94%
34
Alien
ok
94%
35
Alien
ok
94%
36
Alien
ok
94%
37
Alien
ok
94%
38
Alien
ok
94%
39
Alien
ok
94%
40
Alien
ok
94%
41
Alien
ok
94%
42
Alien
ok
94%
43
Alien
ok
94%
44
Alien
ok
94%
45
Alien
ok
94%
46
Alien
ok
94%
47
Alien
ok
94%
48
Alien
ok
94%
49
Alien
ok
94%
50
Alien
ok
94%
51
Alien
ok
94%
52
Alien
ok
94%
53
Alien
ok
94%
54
Alien
ok
94%
55
Alien
ok
94%
56
Alien
ok
94%
57
Alien
ok
94%
58
Alien
ok
94%
59
Alien
ok
94%
60
Alien
ok
94%
61
Alien
ok
94%
62
Alien
ok
94%
63
Alien
ok
94%
64
Alien
ok
94%
65
Alien
ok
94%
66
Alien
ok
94%
67
Alien
ok
94%
68
Alien
ok
95%
69
Alien
ok
95%
70
Alien
ok
95%
71
Alien
ok
95%
72
Alien
ok
95%
73
Alien
ok
95%
74
Alien
ok
95%
75
Alien
ok
95%
76
Alien
ok
95%
77
Alien
ok
95%
78
Alien
ok
95%
79
Alien
ok
95%
80
Alien
ok
95%
81
Alien
ok
95%
82
Alien
ok
95%
83
Alien
ok
95%
84
Alien
ok
95%
85
Alien
ok
95%
86
Alien
ok
95%
87
Alien
ok
95%
88
Alien
ok
95%
89
Alien
ok
95%
90
Alien
ok
95%
91
Alien
ok
95%
92
Alien
ok
95%
93
Alien
ok
95%
94
Alien
ok
95%
95
Alien
ok
95%
96
Alien
ok
95%
97
Alien
ok
95%
98
Alien
ok
95%
99
Alien
ok
95%
100
Alien
ok
95%
Percentages are Steam's global unlock rates across all players who own 100 hidden aliens, refreshed daily. Under 5% is marked in the lit blue.