I've never defended a large scale siege with fairly trained dwarfs (but I have defended large sieges with danger room trained dwarf and/or draw bridges and I have fended off small ambushes with regularly trained dwarves)
I've never developed a large scale cloth industry (but I have made clothes in small quantities to have replacements for my dwarfs)
I've never breach the aquifer with pumps (although I have breached it with cave ins, even a two layer aquifer once with a two largge sequential cave-ins nested in each other)
I've never made a real mega project (I've made 6 pump mister systems and some decent sized tower, but nothing really big)
I've never made a large scale, fully functional minecart system (I have made small scale systemt to try it out)
I've never sustained a 200 population fortress for extended periods of time (fps+boredom, I only make it that far walling off the caverns and restricting outside access so it gets boring, and then I breach HFS or I open up and a real siege gets inside)
I've never tamed any really cool animal populations (tamed and breed a large number of ravens once to learn the mechanic, but nothing useful or monstrous or cool)
I've never maxed out an adventurer's stats (I will occasionally grind when I want to get some traits up, but never got an all around powerful adventure, I get sloppy once they start to get strong...)
I've never used magma in a trap (I use it for forges, and I've used large scale traps before, like double bridge based 5-z level drops before (just enough to stun and critically wound, but leaves the goblins alive for soldier to kill for practice)
So yeah, I've tried everything at least once, but I don't tend to excel at anything really dwarfy. I think I am going to try a wood based surface fort with this new update for variety.