NoStartUpTime - If he dont have lags use PlaySound or KeyPress to check how he have NoStartUpTime.
NoFireInterval this is blocked be server but if he set to 50% this work but hard to detect such changes due to the ping.
BetterDamage he can modificy damage most polular method is x5 dmg use WriteConslole to se all hits players if he hit and is 1 measage dmg he not use if is x5 or x2 he have hack.
Ammo is netcode is repair this see on specator... If he saw is big range he have modificy speed.
NoBink this is random up or down, if despite receiving damage it is able to hit a longer distance, you can sometimes be lucky but if he says that he has learned to cope with it.. he is stupid hacker..
NoRecoil - this be see even if you move specially mouse.
NoBulletSpread - this be see but is bug is u shoot and press esc menu u get NoRecoil and NoBulletSpread.
NoMovementAcc - The most popular hack for users barrett, generally if a player says he does not know what is it and very good using barret he is hack. If a player falls freely, you can look up certain relationships and learn how to hit, but if player fly left or right and dont prone and hit from large distances often is hacker.
Recorded a video but you would banned me.
