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 133 bullets
Shoot 134 bullets
Shoot 129 bullets
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Shoot 131 bullets
Shoot 424 bullets
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Shoot 375 bullets
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Shoot 372 bullets
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Shoot 349 bullets
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Shoot 339 bullets
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Shoot 328 bullets
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Shoot 320 bullets
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Shoot 296 bullets
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Shoot 291 bullets
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Shoot 287 bullets
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Shoot 276 bullets
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Shoot 271 bullets
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Shoot 266 bullets
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Shoot 258 bullets
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Shoot 238 bullets
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Shoot 177 bullets
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Shoot 136 bullets
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Shoot 135 bullets
Shoot 128 bullets
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Shoot 115 bullets
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Shoot 112 bullets
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Shoot 109 bullets
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Shoot 111 bullets
Shoot 105 bullets
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Shoot 95 bullets
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Shoot 2 bullets
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Shoot 1 bullet