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 425 bullets
Shoot 426 bullets
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Shoot 418 bullets
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Shoot 379 bullets
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Shoot 372 bullets
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Shoot 367 bullets
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Shoot 363 bullets
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Shoot 357 bullets
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Shoot 345 bullets
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Shoot 342 bullets
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Shoot 334 bullets
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Shoot 310 bullets
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Shoot 303 bullets
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Shoot 309 bullets
Shoot 299 bullets
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Shoot 292 bullets
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Shoot 286 bullets
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Shoot 279 bullets
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Shoot 285 bullets
Shoot 275 bullets
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Shoot 278 bullets
Shoot 272 bullets
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Shoot 274 bullets
Shoot 268 bullets
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Shoot 270 bullets
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Shoot 262 bullets
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Shoot 256 bullets
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Shoot 239 bullets
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Shoot 227 bullets
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Shoot 213 bullets
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Shoot 196 bullets
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Shoot 190 bullets
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Shoot 194 bullets
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Shoot 187 bullets
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Shoot 176 bullets
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Shoot 169 bullets
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Shoot 133 bullets
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Shoot 125 bullets
Shoot 116 bullets
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Shoot 110 bullets
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Shoot 115 bullets
Shoot 103 bullets
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Shoot 109 bullets
Shoot 96 bullets
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Shoot 91 bullets
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Shoot 79 bullets
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Shoot 72 bullets
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Shoot 48 bullets
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Shoot 38 bullets
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Shoot 16 bullets
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Shoot 6 bullets
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Shoot 2 bullets
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Shoot 1 bullet