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 395 bullets
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Shoot 393 bullets
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Shoot 384 bullets
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Shoot 377 bullets
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Shoot 372 bullets
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Shoot 368 bullets
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Shoot 366 bullets
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Shoot 345 bullets
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Shoot 341 bullets
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Shoot 338 bullets
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Shoot 315 bullets
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Shoot 308 bullets
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Shoot 305 bullets
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Shoot 299 bullets
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Shoot 294 bullets
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Shoot 291 bullets
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Shoot 293 bullets
Shoot 287 bullets
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Shoot 283 bullets
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Shoot 278 bullets
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Shoot 282 bullets
Shoot 276 bullets
Shoot 277 bullets
Shoot 271 bullets
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Shoot 275 bullets
Shoot 266 bullets
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Shoot 270 bullets
Shoot 263 bullets
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Shoot 258 bullets
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Shoot 254 bullets
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Shoot 237 bullets
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Shoot 206 bullets
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Shoot 197 bullets
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Shoot 194 bullets
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Shoot 189 bullets
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Shoot 186 bullets
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Shoot 188 bullets
Shoot 169 bullets
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Shoot 167 bullets
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Shoot 136 bullets
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Shoot 119 bullets
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Shoot 113 bullets
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Shoot 116 bullets
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Shoot 110 bullets
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Shoot 105 bullets
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Shoot 96 bullets
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Shoot 93 bullets
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Shoot 83 bullets
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Shoot 77 bullets
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Shoot 7 bullets
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Shoot 2 bullets
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Shoot 1 bullet