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 422 bullets
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Shoot 417 bullets
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Shoot 388 bullets
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Shoot 355 bullets
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Shoot 349 bullets
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Shoot 340 bullets
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Shoot 333 bullets
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Shoot 316 bullets
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Shoot 306 bullets
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Shoot 296 bullets
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Shoot 291 bullets
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Shoot 286 bullets
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Shoot 281 bullets
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Shoot 277 bullets
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Shoot 280 bullets
Shoot 269 bullets
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Shoot 262 bullets
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Shoot 257 bullets
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Shoot 246 bullets
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Shoot 234 bullets
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Shoot 227 bullets
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Shoot 198 bullets
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Shoot 191 bullets
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Shoot 185 bullets
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Shoot 176 bullets
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Shoot 130 bullets
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Shoot 119 bullets
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Shoot 118 bullets
Shoot 108 bullets
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Shoot 101 bullets
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Shoot 92 bullets
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Shoot 79 bullets
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Shoot 4 bullets
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Shoot 2 bullets
Shoot 3 bullets
Shoot 1 bullet