| Answer | Crossword Clue |
|---|---|
| BREAKTHROUGH | Milestone of success |
| MAGNACHARTA | Milestone of democracy |
| YEAR | Milestone of time. |
| ONEMILLION | Milestone of wealth |
| EROICA | Milestone of classical music |
| IPO | Groupon milestone of 2011 |
| IPO | Facebook milestone of 2012 |
| CHAUCER | Milestone of English literature. |
| STEP | Milestone of a baby's progress. |
| TESTBANTREATY | Milestone of Sept. 24, 1963. |
| IGY | Global milestone of science: Abbr. |
| IPO | Twitter milestone of 2013, for short |
| LAPRENSA | Milestone in the freedom-of-the-press story. |
