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 420 bullets
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Shoot 394 bullets
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Shoot 386 bullets
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Shoot 380 bullets
Shoot 372 bullets
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Shoot 366 bullets
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Shoot 350 bullets
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Shoot 336 bullets
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Shoot 315 bullets
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Shoot 305 bullets
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Shoot 297 bullets
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Shoot 293 bullets
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Shoot 287 bullets
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Shoot 280 bullets
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Shoot 276 bullets
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Shoot 271 bullets
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Shoot 275 bullets
Shoot 268 bullets
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Shoot 256 bullets
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Shoot 237 bullets
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Shoot 228 bullets
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Shoot 175 bullets
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Shoot 166 bullets
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Shoot 136 bullets
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Shoot 115 bullets
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Shoot 109 bullets
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Shoot 103 bullets
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Shoot 100 bullets
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Shoot 94 bullets
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Shoot 2 bullets
Shoot 1 bullet