Here's a short list of achievements that cannot currently be attained in the game due to bugs or oversight:
Almost - Kill a monster with your orb that would otherwise destroy your orb Orb damage was removed in a recent patch
Flea Trap - Kill 45 cursed monsters with your orb Orb danage was removed in a recent patch
Put the Lights Out - Gain 500 xp from destroying beacons Beacon XP does not increase the counter for this achievement
Bone Shredder - Kill 600 monsters before wave 12 starts The bar counts up, then keeps counting past 600 without awarding you the achievement
Stormy Weather - Have the beacon storm trait set to Level 7 at field N7 N7 does not exist, probably due to the bug with the third compass reward
Lockpick O4 - Destroy all wizard locks at field O4 before wave 18 starts O4 does not have wizard locks. O6 does, but doing this in O6 does not award the achivement
Firstly, shadow projectiles can move either towards your attack gem (which I believe, on contact, cause it to force-resocket) or towards you orb (which takes mana away from you on impact). The former, I have no advice on, but for the latter, surround your orb with grade 3 or 4 gems of any kind. This should shoot down any projectile that dares venture near your orb.
Have anyone acquire "Artisan traper"? Description say - kill every monster with gems in traps. I ran F1 and killed every monster with traps, but did not get this achivement.
If you used Poison gems in traps there is a chance that you killed few mobs with poison and not with the raw damage of the gem. Just try F1 with no traits and put there few G(rade)3 or G4 gems (not Green, so you won't have to risk killing with special ability once more).
@thebigbox, Surround a grade 3 gem with amplifiers. Poolbound works well as they are high damage. You can upgrade the gems in the amplifiers until you get the achievement.
I'm unable to get Laying Low: E7 for some reason. I make a single Grade 1 Chain Hit and a Grade 1 Poolbound, Combine them into a Grade 2 Dual, then Duplicate that one gem into all my towers and amplifiers, but it won't give me credit. Is this only achievable on Glaring difficulty, even though it doesn't specify that in the description?
Can you give more info? Difficulty, level, anything you might think is helpful? I just tried it with towers-only on Looming, then Towers+Amps on Glaring, and didn't get the achievement either time. Definitely only Grade 2 gems the whole way.
I have only ONE left: "Leave a Monster Nest with 1HP." How many HUNDREDS of Nests do you need to violate to GET it??? I mean, even my G1 gems have enough min/max dmg amplitude to make this a REAL PAIN...
what psorek said: with a high-armor nest, each shot does exactly one damage. well...sometimes 2, the +% damage against buildings seems to apply after the armor-check.
Have anyone acquired "Use only X gems at field Y"? Seems to me that they are bugged, when I start the waves, achievement is marked as failed - even if there is no gems on the field.