Python 2, 1074 1064 1042 1039 bytes

Each program has the form print'\<octal char code>', except for:

• ' → print"\47"
• 0 through 8 → print~-<N+1>
• 9 → print-~8
• \ → print chr(92)
• i → exec'pr\151nt"\151"'
• n → exec'pri\156t"\156"'
• p → exec'\160rint"\160"'
• r → exec'p\162int"\162"'
• t → exec'prin\164"\164"'

For reference and ease of testing, here's the full list of programs, newline-separated.

print'\40'
print'\41'
print'\42'
print'\43'
print'\44'
print'\45'
print'\46'
print"\47"
print'\50'
print'\51'
print'\52'
print'\53'
print'\54'
print'\55'
print'\56'
print'\57'
print~-1
print~-2
print~-3
print~-4
print~-5
print~-6
print~-7
print~-8
print~-9
print-~8
print'\72'
print'\73'
print'\74'
print'\75'
print'\76'
print'\77'
print'\100'
print'\101'
print'\102'
print'\103'
print'\104'
print'\105'
print'\106'
print'\107'
print'\110'
print'\111'
print'\112'
print'\113'
print'\114'
print'\115'
print'\116'
print'\117'
print'\120'
print'\121'
print'\122'
print'\123'
print'\124'
print'\125'
print'\126'
print'\127'
print'\130'
print'\131'
print'\132'
print'\133'
print chr(92)
print'\135'
print'\136'
print'\137'
print'\140'
print'\141'
print'\142'
print'\143'
print'\144'
print'\145'
print'\146'
print'\147'
print'\150'
exec'pr\151nt"\151"'
print'\152'
print'\153'
print'\154'
print'\155'
exec'pri\156t"\156"'
print'\157'
exec'\160rint"\160"'
print'\161'
exec'p\162int"\162"'
print'\163'
exec'prin\164"\164"'
print'\165'
print'\166'
print'\167'
print'\170'
print'\171'
print'\172'
print'\173'
print'\174'
print'\175'
print'\176'

To test:

$ python printables.py | sed ':a;N;$!ba;s/\n//g'
 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~