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
Shoot 423 bullets
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Shoot 415 bullets
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Shoot 369 bullets
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Shoot 363 bullets
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Shoot 344 bullets
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Shoot 308 bullets
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Shoot 295 bullets
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Shoot 282 bullets
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Shoot 280 bullets
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Shoot 275 bullets
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Shoot 274 bullets
Shoot 268 bullets
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Shoot 263 bullets
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Shoot 256 bullets
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Shoot 248 bullets
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Shoot 237 bullets
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Shoot 227 bullets
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Shoot 206 bullets
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Shoot 116 bullets
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Shoot 111 bullets
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Shoot 107 bullets
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Shoot 96 bullets
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Shoot 69 bullets
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Shoot 5 bullets
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Shoot 1 bullet