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 427 bullets
Shoot 428 bullets
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Shoot 366 bullets
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Shoot 349 bullets
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Shoot 308 bullets
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Shoot 297 bullets
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Shoot 300 bullets
Shoot 292 bullets
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Shoot 288 bullets
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Shoot 284 bullets
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Shoot 280 bullets
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Shoot 275 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 255 bullets
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Shoot 196 bullets
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Shoot 118 bullets
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Shoot 114 bullets
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Shoot 109 bullets
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Shoot 105 bullets
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Shoot 1 bullet
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Shoot 4 bullets