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 379 bullets
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Shoot 374 bullets
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Shoot 365 bullets
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Shoot 361 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 335 bullets
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Shoot 309 bullets
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Shoot 297 bullets
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Shoot 300 bullets
Shoot 293 bullets
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Shoot 288 bullets
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Shoot 283 bullets
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Shoot 280 bullets
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Shoot 275 bullets
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Shoot 271 bullets
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Shoot 274 bullets
Shoot 268 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 247 bullets
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Shoot 238 bullets
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Shoot 229 bullets
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Shoot 225 bullets
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Shoot 212 bullets
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Shoot 199 bullets
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Shoot 195 bullets
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Shoot 194 bullets
Shoot 186 bullets
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Shoot 177 bullets
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Shoot 138 bullets
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Shoot 125 bullets
Shoot 117 bullets
Shoot 118 bullets
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Shoot 114 bullets
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Shoot 116 bullets
Shoot 109 bullets
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Shoot 111 bullets
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Shoot 105 bullets
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Shoot 97 bullets
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Shoot 92 bullets
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Shoot 89 bullets
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Shoot 85 bullets
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Shoot 67 bullets
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Shoot 38 bullets
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Shoot 1 bullet
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Shoot 3 bullets