Losing awareness easily
When you need to lose your awareness, bribe a herald, then immediately pickpocket him 
to get the money back. If this is done quickly enough, your awareness meter will not 
go back up. -From: Cody Callahan

Easy "Almost Flying" achievement
The Galata Tower is the building you climb in DNA Sequence 2: Memory 3. It is the 
highest building on the northern part of the map, and right in front of the Assassin's HQ. 
Make sure you have a parachute (can be bought from tailors), then jump from the tower 
and glide towards the water. When you jump off, immediately press X to open the parachute. 
Just keep gliding towards the water until you automatically drop into the water and get 
the "Almost Flying" achievement.

Easy "I Can See You" and "Lightning Strikes" achievements
Go to the Fatih Camii building (travel there by using a tunnel entrance). Climb to the 
rooftop. There are eight guards in the courtyard. Use a Cherry Bomb to get them to stand 
close together. Once they are standing close together, throw a Smoke Bomb, and jump down 
to the courtyard. Use your hidden blade to kill five of them within five seconds to get 
the "I Can See You" and "Lightning Strikes" achievements.

Easy "Iron Curtain" achievement
Replay DNA Sequence 2: Memory 6. This memory is basically the tutorial about the den 
defense system. Your den may not be hit at all. Do not use LT, as it will trigger a 
cannon shot, which would prevent the achievement from being earned. Make sure you install 
barricades wherever possible. At the very end, a battering ram will roll in, and the 
barricades are needed to slow it down. You can also use your pistol by pressing X to 
support your allies.

Easy "Monster's Dance" achievement
Search for a guard that is near a large group of civilians. Patrolling guards that 
walk across markets work best. Poison the guard, then throw money on him (select 
"Throw Money" from the weapon wheel) to attract civilians. The guard will begin to 
knock them out when they are nearby.

Easy "Mosh Pit" achievement
You must first craft a Datura Bomb. The following ingredients are needed: Impact 
Shell, British Gunpowder, and Datura Powder. You can easily get the ingredients 
by opening bomb crafting stations that are scattered throughout the city. 
You also need Cherry Bombs to lure multiple enemies. You can craft them or buy 
them. Go to the Fatih Camii building (travel there by using a tunnel entrance), 
and climb to the rooftop. There are eight guards in the courtyard. Throw Cherry 
Bombs until more guards come in. Once there are at least ten guards standing close 
together, throw the Datura Bomb to get the "Mosh Pit" achievement.

Easy "Mouse Trap" achievement
You do not need to kill five guards at once, just five guards in total. Caltrop 
Bombs can be bought from all Black Market Dealers around the city. Search for a 
destructible scaffold, then get into a conflict with some guards. Lure them near 
the scaffold, select the Caltrop Bomb from your weapon wheel, and press Y to throw 
it. Run towards the edge of the scaffold, and press B to bring it down. Let them 
kill you, and repeat the process until you get the "Mouse Trap" achievement.

Easy "Show-Off" achievement
You first must have a parachute before attempting this. They can be bought from 
tailors. Search for a viewpoint with some ziplines nearby. When you jump off the 
viewpoint, immediately press X to open the parachute. Once you are over the zipline, 
press B to release, then quickly hold B to grab the zipline and get the "Show-Off" 
achievement.

Easy "Silent But Deadly" achievement
Replay DNA Sequence 1: Memory 5. After the cutscene at the very beginning, you will 
need to fight three soldiers. Select the throwing knives from your weapon wheel, 
then hold Y and release it to throw three knives at once and kill the soldiers to 
get the "Silent But Deadly" achievement.

Easy "Spider Assassin" achievement
Hagia Sofia is located in the Imperial district. Use a tunnel entrance to travel 
there. You should wait until you get the Hookblade in DNA Sequence 2: Memory 3 
before attempting this. The Hookblade will allow you to climb much faster. Climb 
from the bottom of the building to the pillar on top in under 25 seconds to get 
the "Spider Assassin" achievement.

Easy "Tax Evasion" achievement
Templar tax collectors appear randomly. They have a red purse symbol above their 
head. It may take a while, but one will eventually appear on your mini-map. 
You may first have to complete the story before one appears. Once you find a 
Templar tax collector, simply kill him with your hidden blade to get the 
"Tax Evasion" achievement.