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 389 bullets
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Shoot 385 bullets
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Shoot 374 bullets
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Shoot 364 bullets
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Shoot 359 bullets
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Shoot 342 bullets
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Shoot 297 bullets
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Shoot 291 bullets
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Shoot 275 bullets
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Shoot 280 bullets
Shoot 269 bullets
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Shoot 258 bullets
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Shoot 255 bullets
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Shoot 238 bullets
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Shoot 195 bullets
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Shoot 194 bullets
Shoot 187 bullets
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Shoot 137 bullets
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Shoot 117 bullets
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Shoot 112 bullets
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Shoot 108 bullets
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Shoot 111 bullets
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Shoot 2 bullets
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Shoot 1 bullet