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 139 bullets
Shoot 140 bullets
Shoot 135 bullets
Shoot 136 bullets
Shoot 137 bullets
Shoot 138 bullets
Shoot 129 bullets
Shoot 130 bullets
Shoot 131 bullets
Shoot 133 bullets
Shoot 134 bullets
Shoot 427 bullets
Shoot 428 bullets
Shoot 422 bullets
Shoot 423 bullets
Shoot 424 bullets
Shoot 425 bullets
Shoot 426 bullets
Shoot 416 bullets
Shoot 417 bullets
Shoot 418 bullets
Shoot 419 bullets
Shoot 420 bullets
Shoot 421 bullets
Shoot 410 bullets
Shoot 411 bullets
Shoot 412 bullets
Shoot 413 bullets
Shoot 414 bullets
Shoot 415 bullets
Shoot 405 bullets
Shoot 406 bullets
Shoot 407 bullets
Shoot 408 bullets
Shoot 409 bullets
Shoot 400 bullets
Shoot 401 bullets
Shoot 402 bullets
Shoot 403 bullets
Shoot 404 bullets
Shoot 395 bullets
Shoot 396 bullets
Shoot 397 bullets
Shoot 398 bullets
Shoot 399 bullets
Shoot 389 bullets
Shoot 390 bullets
Shoot 391 bullets
Shoot 392 bullets
Shoot 393 bullets
Shoot 394 bullets
Shoot 385 bullets
Shoot 386 bullets
Shoot 387 bullets
Shoot 388 bullets
Shoot 381 bullets
Shoot 382 bullets
Shoot 383 bullets
Shoot 384 bullets
Shoot 375 bullets
Shoot 376 bullets
Shoot 377 bullets
Shoot 378 bullets
Shoot 379 bullets
Shoot 380 bullets
Shoot 370 bullets
Shoot 371 bullets
Shoot 372 bullets
Shoot 373 bullets
Shoot 374 bullets
Shoot 366 bullets
Shoot 367 bullets
Shoot 368 bullets
Shoot 369 bullets
Shoot 361 bullets
Shoot 362 bullets
Shoot 363 bullets
Shoot 364 bullets
Shoot 365 bullets
Shoot 353 bullets
Shoot 354 bullets
Shoot 355 bullets
Shoot 356 bullets
Shoot 357 bullets
Shoot 358 bullets
Shoot 359 bullets
Shoot 360 bullets
Shoot 349 bullets
Shoot 350 bullets
Shoot 351 bullets
Shoot 352 bullets
Shoot 346 bullets
Shoot 347 bullets
Shoot 348 bullets
Shoot 345 bullets
Shoot 341 bullets
Shoot 342 bullets
Shoot 343 bullets
Shoot 344 bullets
Shoot 335 bullets
Shoot 336 bullets
Shoot 337 bullets
Shoot 338 bullets
Shoot 339 bullets
Shoot 340 bullets
Shoot 329 bullets
Shoot 330 bullets
Shoot 331 bullets
Shoot 332 bullets
Shoot 333 bullets
Shoot 334 bullets
Shoot 324 bullets
Shoot 325 bullets
Shoot 326 bullets
Shoot 327 bullets
Shoot 328 bullets
Shoot 320 bullets
Shoot 321 bullets
Shoot 322 bullets
Shoot 323 bullets
Shoot 314 bullets
Shoot 315 bullets
Shoot 316 bullets
Shoot 317 bullets
Shoot 318 bullets
Shoot 319 bullets
Shoot 309 bullets
Shoot 310 bullets
Shoot 311 bullets
Shoot 312 bullets
Shoot 313 bullets
Shoot 306 bullets
Shoot 307 bullets
Shoot 308 bullets
Shoot 300 bullets
Shoot 301 bullets
Shoot 302 bullets
Shoot 303 bullets
Shoot 304 bullets
Shoot 305 bullets
Shoot 295 bullets
Shoot 296 bullets
Shoot 297 bullets
Shoot 298 bullets
Shoot 299 bullets
Shoot 289 bullets
Shoot 290 bullets
Shoot 291 bullets
Shoot 292 bullets
Shoot 293 bullets
Shoot 294 bullets
Shoot 283 bullets
Shoot 284 bullets
Shoot 285 bullets
Shoot 286 bullets
Shoot 287 bullets
Shoot 288 bullets
Shoot 279 bullets
Shoot 280 bullets
Shoot 281 bullets
Shoot 282 bullets
Shoot 276 bullets
Shoot 277 bullets
Shoot 278 bullets
Shoot 270 bullets
Shoot 271 bullets
Shoot 272 bullets
Shoot 273 bullets
Shoot 274 bullets
Shoot 275 bullets
Shoot 265 bullets
Shoot 266 bullets
Shoot 267 bullets
Shoot 268 bullets
Shoot 269 bullets
Shoot 256 bullets
Shoot 257 bullets
Shoot 258 bullets
Shoot 259 bullets
Shoot 260 bullets
Shoot 261 bullets
Shoot 262 bullets
Shoot 263 bullets
Shoot 264 bullets
Shoot 254 bullets
Shoot 255 bullets
Shoot 250 bullets
Shoot 251 bullets
Shoot 252 bullets
Shoot 253 bullets
Shoot 229 bullets
Shoot 230 bullets
Shoot 231 bullets
Shoot 232 bullets
Shoot 233 bullets
Shoot 234 bullets
Shoot 235 bullets
Shoot 236 bullets
Shoot 237 bullets
Shoot 238 bullets
Shoot 239 bullets
Shoot 240 bullets
Shoot 241 bullets
Shoot 242 bullets
Shoot 243 bullets
Shoot 244 bullets
Shoot 245 bullets
Shoot 246 bullets
Shoot 247 bullets
Shoot 248 bullets
Shoot 249 bullets
Shoot 224 bullets
Shoot 225 bullets
Shoot 226 bullets
Shoot 227 bullets
Shoot 228 bullets
Shoot 219 bullets
Shoot 220 bullets
Shoot 221 bullets
Shoot 222 bullets
Shoot 223 bullets
Shoot 213 bullets
Shoot 214 bullets
Shoot 215 bullets
Shoot 216 bullets
Shoot 217 bullets
Shoot 218 bullets
Shoot 209 bullets
Shoot 210 bullets
Shoot 211 bullets
Shoot 212 bullets
Shoot 198 bullets
Shoot 199 bullets
Shoot 200 bullets
Shoot 201 bullets
Shoot 202 bullets
Shoot 203 bullets
Shoot 204 bullets
Shoot 205 bullets
Shoot 206 bullets
Shoot 207 bullets
Shoot 208 bullets
Shoot 193 bullets
Shoot 194 bullets
Shoot 195 bullets
Shoot 196 bullets
Shoot 197 bullets
Shoot 186 bullets
Shoot 187 bullets
Shoot 188 bullets
Shoot 189 bullets
Shoot 190 bullets
Shoot 191 bullets
Shoot 192 bullets
Shoot 181 bullets
Shoot 182 bullets
Shoot 183 bullets
Shoot 184 bullets
Shoot 185 bullets
Shoot 174 bullets
Shoot 175 bullets
Shoot 176 bullets
Shoot 177 bullets
Shoot 178 bullets
Shoot 179 bullets
Shoot 180 bullets
Shoot 168 bullets
Shoot 169 bullets
Shoot 170 bullets
Shoot 171 bullets
Shoot 172 bullets
Shoot 173 bullets
Shoot 163 bullets
Shoot 164 bullets
Shoot 165 bullets
Shoot 166 bullets
Shoot 167 bullets
Shoot 158 bullets
Shoot 159 bullets
Shoot 160 bullets
Shoot 161 bullets
Shoot 162 bullets
Shoot 153 bullets
Shoot 154 bullets
Shoot 155 bullets
Shoot 156 bullets
Shoot 157 bullets
Shoot 146 bullets
Shoot 147 bullets
Shoot 148 bullets
Shoot 149 bullets
Shoot 150 bullets
Shoot 151 bullets
Shoot 152 bullets
Shoot 142 bullets
Shoot 143 bullets
Shoot 144 bullets
Shoot 145 bullets
Shoot 141 bullets
Shoot 127 bullets
Shoot 128 bullets
Shoot 120 bullets
Shoot 121 bullets
Shoot 122 bullets
Shoot 123 bullets
Shoot 124 bullets
Shoot 125 bullets
Shoot 126 bullets
Shoot 115 bullets
Shoot 116 bullets
Shoot 117 bullets
Shoot 118 bullets
Shoot 119 bullets
Shoot 109 bullets
Shoot 110 bullets
Shoot 111 bullets
Shoot 112 bullets
Shoot 113 bullets
Shoot 114 bullets
Shoot 104 bullets
Shoot 105 bullets
Shoot 106 bullets
Shoot 107 bullets
Shoot 108 bullets
Shoot 99 bullets
Shoot 100 bullets
Shoot 101 bullets
Shoot 102 bullets
Shoot 103 bullets
Shoot 92 bullets
Shoot 93 bullets
Shoot 94 bullets
Shoot 95 bullets
Shoot 96 bullets
Shoot 97 bullets
Shoot 98 bullets
Shoot 86 bullets
Shoot 87 bullets
Shoot 88 bullets
Shoot 89 bullets
Shoot 90 bullets
Shoot 91 bullets
Shoot 81 bullets
Shoot 82 bullets
Shoot 83 bullets
Shoot 84 bullets
Shoot 85 bullets
Shoot 75 bullets
Shoot 76 bullets
Shoot 77 bullets
Shoot 78 bullets
Shoot 79 bullets
Shoot 80 bullets
Shoot 70 bullets
Shoot 71 bullets
Shoot 72 bullets
Shoot 73 bullets
Shoot 74 bullets
Shoot 63 bullets
Shoot 64 bullets
Shoot 65 bullets
Shoot 66 bullets
Shoot 67 bullets
Shoot 68 bullets
Shoot 69 bullets
Shoot 59 bullets
Shoot 60 bullets
Shoot 61 bullets
Shoot 62 bullets
Shoot 52 bullets
Shoot 53 bullets
Shoot 54 bullets
Shoot 55 bullets
Shoot 56 bullets
Shoot 57 bullets
Shoot 58 bullets
Shoot 44 bullets
Shoot 45 bullets
Shoot 46 bullets
Shoot 47 bullets
Shoot 48 bullets
Shoot 49 bullets
Shoot 50 bullets
Shoot 51 bullets
Shoot 38 bullets
Shoot 39 bullets
Shoot 40 bullets
Shoot 41 bullets
Shoot 42 bullets
Shoot 43 bullets
Shoot 34 bullets
Shoot 35 bullets
Shoot 36 bullets
Shoot 37 bullets
Shoot 26 bullets
Shoot 27 bullet
Shoot 28 bullet
Shoot 29 bullets
Shoot 30 bullets
Shoot 31 bullets
Shoot 32 bullets
Shoot 33 bullets
Shoot 23 bullets
Shoot 24 bullets
Shoot 25 bullets
Shoot 16 bullets
Shoot 17 bullets
Shoot 18 bullets
Shoot 19 bullets
Shoot 20 bullets
Shoot 21 bullets
Shoot 22 bullets
Shoot 11 bullets
Shoot 12 bullets
Shoot 13 bullets
Shoot 14 bullets
Shoot 15 bullets
Shoot 4 bullets
Shoot 5 bullets
Shoot 6 bullets
Shoot 7 bullets
Shoot 8 bullets
Shoot 9 bullets
Shoot 10 bullets
Shoot 3 bullets
Shoot 2 bullets
Shoot 1 bullet