The Hidden Blade Assassin's Creed in Depth

Just spitballing here:

Dye your robes
Recruit an Assassin to the brotherhood
Perform 100 (other number) Leaps of Faith
Kill a brute in combat with only your hidden blade
Kill an enemy with a garden tool
perform 15 (other number) kills from a hay bale
Drown 15 (other number) enemies
Die from a fall
Run end-to-end across the aqueducts
Kill a doctor

I dunno, there's so many you can choose from the achievements, haha

I'm confused about "never use ranged weapons". Do you mean complete the entire game without using ranged weapons?

I like this concept though. Here's more ideas:
Level up a recruit to rank 4 without sending him/her on missions
Win the final fight at Bartolomeo's fighting ring
Kill 4 papal guards in 5 seconds
Make a poisoned guard kill 5 civilians
Parachute from the top of the Castel Sant'Angelo and assassinate a guard as you land.
Hyperblend to the top of a Borgia tower
Slit the throats of 3 guards at once by using the long weapon's special attack

Yes, exactly what you're saying. No use of any bomb, bolt, bullet, knife or poison dart in the entire game. Wait, is it compatible with full synchronization of every sequence? I think so.

Edit: yes, it is. Also, I don't really see "kill a doctor". Like S4M6 you say?

If the point of these is to see who can get a bingo first, is it really fair to put game completion objectives alongside "buy this" objectives?

As for the doctor, I was just thinking of random things to do in the game... just, kill a doctor (now that I think about it, can you?)

This guy counts, right?

Yes, I know about him. But can you randomly kill a doctor on the side of the road?

I'm not sure how it typically goes, but if all runners use the same bingo card, then your point is moot.
However, if different runners use different bingo cards, then this would make for interesting competition as superior players can get a shitty bingo card while others get regular or good bingo cards. Furthermore, there are 12 different combinations you can choose to complete to get a bingo (5 horizontal, 5 vertical, 2 diagonal), and you can always exclude any 4 objectives you don't like (4 objectives in 4 rows, take the 5th row), and in most cases even more than 5 objectives you don't like (unless these 5 are all on different rows and columns). So there's plenty of options even if you're dealt a bad hand.
Let's not get into the ratio of easy versus hard objectives.

Thanks for the ideas, guys. The principle is to share a bingo card with multiple players and race.

I'll pick up some more ideas in the trophies, in DNA and in the rest of the game as well, the pastebin will be updated. You may check my twitch channel if I manage to organise some races! http://www.twitch.tv/fed981

Edit: I think I need some help with "calibrations" as well, which means the number of things and/or their length, correlated to difficulty. Basically, the race begins with a fresh new game so you complete sequence 1 + present 1 (around 1 hour) and then begin to complete the objectives for real. So I'm guessing something like ~15 minutes per objective would be balanced and fair. What do you think?
An example is "complete all memories of Christina": it's not possible in less than 8 hours since you need 100% DNA sync if I'm correct. On another hand, "collect 1 Feather" is for instance too short according to me.

You might wanna edit "level up a recruit to the highest level without sending on missions" then. The highest level takes 3,500 XP, and kills are only worth 1, 2 or 3 XP (source). Calling a recruit in is most efficient if you put him against two guards, IMO. That means average XP for calling one in once is 4. At that rate you'll have to call them in 875 times to level up to the highest rank. True, at higher levels they'll be able to take on more enemies at once, but it's still a very slow process. I think that when I did it I got to rank 5. The difference between levels grows exponentially: 0-10-30-80-180-350-600-1,200-2000-3,500. So I think rank 4 or 5 is more doable.

Agreed, I edited the objective.

Also I think I'm pretty much done with all objectives now, so don't hesitate to correct numbers for balance, or add new objectives. Anything is welcome

Kill a Borgia commander by drowning him
Kill a Borgia commander by letting him fall to his death

Also, I had no idea ACB had so many useless collectible items. 35!?

For the fun of it I would have "kill a target before his assassination mission" just to see if people would try finding early deaths with or without looking them up.

That's an interesting idea but I won't put it because it's not the aim of the bingo