IF ERRORLEVEL returns TRUE if the return code was equal to or higher than the specified errorlevel. In your example, since 0 is lower than 1, the first errorlevel statement will always be true if the actual error code is 0 or above. What you want is to test for errorlevel 1 first.

E.g.:

for %%i in (iidbms iigcc iigcd dmfacp dmfrcp rmcmd qwerty) do (
    tasklist | findstr /i %%i
    if errorlevel 0 if not errorlevel 1 echo process
    if errorlevel 1 if not errorlevel 2 echo process not found
)

Another issue is if you want to echo the actual errorlevel from within the for loop. Since variables are resolved before the start of the loop, echoing %errorlevel% will always echo 0. If you want to echo the value at the execution time, you need to modify the snippet like so:

setlocal enabledelayedexpansion
for %%i in (iidbms iigcc iigcd dmfacp dmfrcp rmcmd qwerty) do (
    tasklist | findstr /i %%i
    if errorlevel 0 if not errorlevel 1 echo %%i ok process found !errorlevel!
    if errorlevel 1 if not errorlevel 2 echo %%i no process found !errorlevel!
)

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