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 419 bullets
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Shoot 375 bullets
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Shoot 367 bullets
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Shoot 343 bullets
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Shoot 338 bullets
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Shoot 308 bullets
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Shoot 286 bullets
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Shoot 282 bullets
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Shoot 278 bullets
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Shoot 274 bullets
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Shoot 269 bullets
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Shoot 264 bullets
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Shoot 259 bullets
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Shoot 253 bullets
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Shoot 237 bullets
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Shoot 227 bullets
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Shoot 179 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 104 bullets
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Shoot 96 bullets
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Shoot 94 bullets
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Shoot 47 bullets
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Shoot 38 bullets
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Shoot 7 bullets
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Shoot 1 bullet