Here is the full list of all 428 Sleengster achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Shoot 425 bullets
Shoot 426 bullets
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Shoot 376 bullets
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Shoot 368 bullets
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Shoot 363 bullets
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Shoot 358 bullets
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Shoot 348 bullets
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Shoot 344 bullets
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Shoot 203 bullets
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Shoot 186 bullets
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Shoot 179 bullets
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Shoot 174 bullets
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Shoot 176 bullets
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Shoot 164 bullets
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Shoot 160 bullets
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Shoot 156 bullets
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Shoot 148 bullets
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Shoot 144 bullets
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Shoot 140 bullets
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Shoot 136 bullets
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Shoot 131 bullets
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Shoot 135 bullets
Shoot 129 bullets
Shoot 130 bullets
Shoot 342 bullets
Shoot 343 bullets
Shoot 338 bullets
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Shoot 334 bullets
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Shoot 329 bullets
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Shoot 298 bullets
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Shoot 293 bullets
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Shoot 284 bullets
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Shoot 278 bullets
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Shoot 273 bullets
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Shoot 277 bullets
Shoot 270 bullets
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Shoot 264 bullets
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Shoot 259 bullets
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Shoot 206 bullets
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Shoot 126 bullets
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Shoot 121 bullets
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Shoot 125 bullets
Shoot 117 bullets
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Shoot 113 bullets
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Shoot 116 bullets
Shoot 110 bullets
Shoot 111 bullets
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Shoot 107 bullets
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Shoot 96 bullets
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Shoot 100 bullets
Shoot 91 bullets
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Shoot 88 bullets
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Shoot 75 bullets
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Shoot 45 bullets
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Shoot 34 bullets
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Shoot 1 bullet
Shoot 2 bullets