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 394 bullets
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Shoot 377 bullets
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Shoot 372 bullets
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Shoot 364 bullets
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Shoot 359 bullets
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Shoot 338 bullets
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Shoot 308 bullets
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Shoot 299 bullets
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Shoot 293 bullets
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Shoot 285 bullets
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Shoot 279 bullets
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Shoot 274 bullets
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Shoot 269 bullets
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Shoot 257 bullets
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Shoot 236 bullets
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Shoot 223 bullets
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Shoot 204 bullets
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Shoot 192 bullets
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Shoot 185 bullets
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Shoot 166 bullets
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Shoot 118 bullets
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Shoot 115 bullets
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Shoot 107 bullets
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Shoot 1 bullet
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Shoot 3 bullets